Search-and-rescue trainers use a rough rule of thumb: about three minutes without air, three hours without shelter in the cold, three days without water, three weeks without food. It's not a scientific limit — everyone's different — but as an order for what to sort first, it's genuinely useful. We built the whole idea around it.
The things you'd reach for before you'd think to Google it: light to see by, a clear way out, the basics of dealing with a serious injury. Kept somewhere you could find with your eyes shut.
Once the immediate danger's passed, the next few hours are about not making things worse: warmth if the heating's off, light and news if the power and Wi-Fi are down.
This is where most official advice stops — and where most households are already behind. Water, food that needs no cooking, and the everyday things you forget until the taps stop.
Beyond three days is where most kits give up. A household with three weeks of food built up, and a real plan for water, is in a different position entirely.
The plan is a single wheeled, drawered chest for the first three tiers — top drawer for the first three minutes, working down. Three weeks of food and water is too much to fit in a drawer, so that part builds up in stock beside the chest, rotated through your normal shopping rather than a scary one-off order.
The UK government's own guidance already asks households to hold three days of supplies, and a bigger public awareness push is on the way. Most people still don't have so much as a torch and a plan by the door. Critical Three is for the household that wants this properly sorted — without turning the spare room into a bunker.
UK households have prepared even a basic grab bag, on the government's own figures.
is the official minimum — and where nearly every product on the market stops.
Not the way you're picturing it. No camo, no doomsday talk. Closer to buying decent smoke alarms than joining a survivalist forum.
No. Most households will start with the first two and build up. The point is knowing what's missing, not buying everything on day one.
We're still finalising the chest and what goes in it. Join the list and you'll see it first — and get a say before it's locked in.
Warwickshire, UK. Built around UK government guidance, UK weather, and UK households.
Five things we're planning, in the order you'd reach for them. Prices and exact contents aren't set — everything below, including specific tools and brands, is our current thinking and can change as the research continues. Join the list and you'll help decide what's actually in each one before it's locked in.
Light, a clear way out, and the basics of dealing with a serious injury — kept somewhere you could find with your eyes shut. Currently planned to include a rescue tool (folding shears, strap cutter, glass breaker — no knife blade) for cutting someone free fast. Sold on its own for a bedroom, hallway or car.
Warmth, a torch and radio, a power bank — everything for a house with no heating, lights or Wi-Fi that isn't a candle or an indoor stove.
Water, no-cook food, and the hygiene basics that get forgotten until the taps stop. Built to the government's own three-day guidance, and a bit beyond it.
All three drawers above, in one wheeled, lockable unit that lives in a hallway, garage or utility room. One thing to check twice a year instead of three things to lose track of. This is the product the whole idea is built around.
The part that doesn't fit in a drawer. Rotating boxes of everyday tinned and dried food, plus a water storage and treatment kit, so the chest's fourth tier is a real plan rather than an empty space.
None of this is available to buy yet. We're deliberately not taking pre-orders until the chest itself and the exact contents are settled — see the News pages for how we're working that out. Any specific tool, brand or item named above is our current plan, not a guarantee — it can change as the research and testing continue.
Short, sourced pieces on being ready — what official guidance actually says, the parts of it that are harder than they look, and how that's shaping what we build.
If you've not looked at GOV.UK's Prepare pages, the official ask is smaller than most people expect: enough to get through roughly three days without power, water or an open shop. The list itself is unglamorous. Two and a half to three litres of drinking water per person, per day, with closer to ten litres if you want enough for cooking and basic hygiene too. Food that needs no cooking and no fridge. A torch that runs on batteries or a wind-up mechanism, because the guidance is specific that torches are safer than candles. A radio, for the same reason phones aren't enough on their own. A portable power bank. A basic first aid kit. A few days of any medication you take. And, easy to forget, a paper copy of the phone numbers you'd actually need if your phone died.
A bigger public campaign built on this advice is expected before the end of 2026, following a Cabinet Office report in July confirming the plan. The reason there's a campaign at all is that almost nobody has acted on the existing guidance: government figures suggest only around one in five UK households has so much as a grab bag ready to go.
None of this is about the worst-case scenarios that get the headlines. A three-day gap is closer to a bad storm, a burst water main, or a long power cut than anything more dramatic — the kind of thing that already happens somewhere in the UK most winters. The three-day figure is also where almost every kit sold in the UK stops, which is one of the reasons we're building Critical Three: it's the floor, not the ceiling.
Water is the part of emergency planning that the numbers make awkward, so it's worth doing the sums properly rather than guessing.
For the three days the government's guidance covers, the minimum is 2.5 to 3 litres of drinking water per person per day — call it 9 litres, or 9 kilograms, per person for three days. A family of four needs roughly 36 litres just to drink. Add cooking and basic hygiene and the comfortable figure rises to about 10 litres per person per day, which is 120 litres for a family of four over three days. That's before anyone's had a proper wash.
Go further out and the numbers stop being something you can keep in a cupboard. The World Health Organization's survival minimum for drinking, cooking and hygiene combined is 7.5 to 15 litres per person per day. Over three weeks, that's somewhere between 160 and 315 litres per person — for a family of four, potentially well over a tonne of water. That's simply not a drawer's worth of anything, which is exactly why we don't try to sell one.
Our approach for the longer stretch is storage, not stockpiling in a box: a large container or water butt, kept full and treated, rather than trying to squeeze three weeks of drinking water into a chest built for the first three days. For the water you do store, boiling for one minute is the most reliable treatment. Chlorine-based tablets need a full thirty minutes to work and don't reliably deal with everything in tap or surface water; chlorine dioxide tablets do better. A filter helps with taste and particles but won't remove viruses on its own — a filter and a chemical treatment together is the safer combination.
Bottled water keeps for one to two years unopened; water you've filled yourself into food-grade containers is best refreshed roughly every six months.
The whole idea behind Critical Three is a chest organised by how fast you'd need each thing. For the first three minutes, three hours and three days, that works: the volumes are small enough to live in a drawer. Three weeks of food and water is a different problem, and it's worth explaining why, because it's the honest reason our fourth tier looks different from the first three.
Twenty-one days of food, at a fairly standard 2,000 calories a day, comes to about 42,000 calories per person. That's a lot of tins, but it's manageable — ordinary supermarket food, bought two or three long-life items at a time on your normal shop, beats specialist survival rations on cost per calorie by a wide margin, and it's food your household will actually recognise and want to eat. Water is the part that doesn't fit in a box at all: at the survival minimum, three weeks works out to somewhere between 160 and 315 litres per person (see our water piece for the full sums). For a family, that's stored in a tank, a butt, or large containers — not a drawer.
So rather than promising a fourth drawer we can't actually fill, our plan for the three-week tier is a rotation system: a log that lives in the chest telling you what you've got, how old it is, and when to swap it out, alongside food and water storage built up gradually and kept separately. It's less dramatic than a single box marked "21 days", but it's the version that's actually true.
We'd rather tell you this now, before you've bought anything, than have you find out the hard way that a drawer of tinned food doesn't add up to three weeks for a family of four.
Three minutes without air. Three hours without shelter in the cold. Three days without water. Three weeks without food. It's a tidy piece of survival lore, often traced to arctic survival training, and it's the whole structure behind Critical Three — so it's worth being straight about how solid it actually is.
The honest answer: it's a rule of thumb, not a set of exact limits, and even the most widely cited source on it calls it a generalisation rather than something scientifically precise. Each limb holds up differently under scrutiny. Three minutes for air is roughly right as the point where you'd lose consciousness or suffer real injury, though people are impaired well before that. Three hours for shelter is the weakest link in the chain — survivable for over a day in some mild conditions, and dangerously optimistic in a blizzard with no proper clothing. Three days for water is a fair average for a healthy adult, though heat, exertion or illness can shorten it considerably. Three weeks for food is, if anything, conservative: recorded hunger strikes with water available have run well beyond that.
We use the rule because it's a genuinely useful order for what to sort first, not because it's a stopwatch. If you're ever in a situation where any of these limits actually matter, the right first move is the same as always: call 999. Everything on this site is about being ready for the ordinary bad day — a power cut, a burst pipe, a flood warning — not a substitute for emergency services.
When we started planning the 3 Minute Drawer — light, a clear way out, the basics for a serious injury — a decent multitool was the obvious fit: something to cut a seatbelt or trapped clothing, break a window, cut a strap. Then we looked at what selling one online in the UK actually involves, and it changed the plan.
The Offensive Weapons Act 2019 already makes it an offence to sell or deliver a bladed item to anyone under 18. The Crime and Policing Act 2026, which received Royal Assent on 29 April 2026, goes further specifically for online sales: buyers now need to prove their age with photo ID at checkout, and again on the doorstep when the parcel arrives — no leaving it with a neighbour, in a locker, or just on the step — and sellers have a duty to flag bulk purchases (six or more bladed articles in one order, or repeat orders to the same buyer or address within 30 days). There's a narrow exemption for non-locking folding knives with a blade of three inches or less, but most multitools worth having, including the great majority of Leatherman's range, use a locking blade and don't qualify.
That matters for us specifically because bundling a locking-blade multitool into the Full Chest would turn every chest sale into a knife sale, with all the extra checks that come with it, for a tool that's only a small part of what's in the drawer. So the current plan for drawer one is a rescue tool with no knife blade at all. We're looking at the Leatherman Raptor Rescue, which does the same job with folding shears, a strap cutter, a ring cutter and a carbide glass breaker instead of a blade — it was developed with input from special-operations medics, EMTs and fire professionals, for exactly the "cut someone free, get out" job the 3 Minute Drawer is built around.
As with everything on the Products page, this isn't locked in — it's our current plan, not a promise of a specific brand. Two things we still want to check before anything ships: that the folding shears themselves aren't separately treated as a bladed article under the same rules, and the exact date the new delivery checks come into force. We'll update this page once we know.