What Disappears From Shops First in an Emergency

When a storm, flood or power cut is forecast, the shops fill up before the weather arrives. The pattern is fairly predictable: bottled water and ready-to-eat food go first, then torches, batteries and candles, then fuel at the pumps, and baby supplies and toilet paper disappear alongside them. The answer is not to join the rush but to keep a modest store at home so a disrupted week never leaves you short.

Official guidance is clear that loss of supply can happen without warning, so it is always useful to have an emergency pack ready in advance¹. Councils advise keeping three days' supply of bottled water and ready-to-eat food that will not spoil, plus some emergency cash accessible². For water specifically, one council suggests 2.5 litres of bottled water per person for each day³.

The reason shelves empty is not usually a shortage of goods but a surge in demand. Councils say plainly that fuel shortages are caused when people buy fuel they do not need¹, and the same applies to food and household goods. A household that already has a few days of supplies does not need to queue, and by staying out of the rush it leaves stock on the shelves for neighbours who cannot stock up in advance.

Food and water go first, so keep a supply at home before you need it

Bottled water and ready-to-eat food are the first things to leave the shelves, because they are what every household needs immediately when power or water is disrupted. The Met Office advises making sure you have basic supplies in case you have to leave home quickly, or your power and water are disrupted⁶. Councils repeat the point: keep bottled water and ready-to-eat food that will not go off at home in the event of an emergency⁷.

The quantity to aim for is modest. Birmingham City Council advises keeping three days' supply of bottled water and ready-to-eat food that will not spoil². For water, Dumfries and Galloway Council suggests 2.5 litres of bottled water per person for each day³. Water is also needed for drinking and sanitation, so store a little more than you expect to drink⁵.

If the power does go off, the order in which you use food matters. Food Standards Scotland advises using up chilled foods first, because they go off quickest, then defrosted frozen food that does not need cooking, then room-temperature perishable food such as bread, and finally room-temperature tinned, bottled and dried food⁸. That order stretches your store and reduces waste.

What you keep matters as much as how much. Choose things you already eat that need no cooking and keep well: tinned goods, dried staples, long-life milk, cereal bars. Our guide to what to keep in an emergency store cupboard sets out a sensible starting list, and how much emergency food to store per person helps you size it to your household. If you are starting from nothing, starting a store cupboard supply step by step walks through it without a big outlay.

Torches, batteries and candles: light runs out quickly in a power cut

When the power goes, light is the first thing people reach for, and the shops empty of torches and batteries within hours. Fire and rescue services advise keeping torches and batteries in an easy to find place¹. The Met Office lists the essentials that could help you cope with a power cut as battery candles, torches and batteries, and a mobile phone power pack⁴.

A few practical points decide whether your lighting works when you need it:

• Keep some torches and spare batteries to hand in case the power cut happens when it is dark outside, and make sure everyone in your home knows where they are kept⁹.
• Use the torch on your mobile only in emergencies for short periods, because it drains the battery heavily¹⁰.
• Prepare battery candles, torches and batteries, and a mobile phone power pack in advance⁴.
• Keep candles and matches or lighters, torches and batteries, and a mobile phone power pack among your snow and winter supplies¹¹.

Our emergency lighting guide covers torches, lanterns and candles in more detail, and the power cuts guide explains what to do when the supply fails.

Petrol queues: why fuel goes early and what it means for your plans

Fuel goes early for the same reason as everything else: demand surges. Central Bedfordshire Council warns that a lack of fuel could occur at any time¹³. Darlington Borough Council notes that disruption could see further depletion through increased consumer demand, or buying fuel that is not needed¹⁴. Lancashire Prepared puts it directly: do not buy fuel you do not need, because fuel shortages are caused when people buy fuel they do not need¹.

The knock-on effects reach further than the forecourt. Dorset Prepared lists what fuel disruption can bring: a rush on forecourts because people are worried about being able to travel; disruption to communities, businesses and schools; reduced ability for lorries and vans to deliver goods to shops; people demonstrating against shortages; and criminals taking the opportunity to try to steal fuel from homes or businesses¹⁵.

For your household, the practical response is to keep the car fuelled in normal times rather than waiting for a warning, and to plan journeys so you are not caught out. Do not store petrol at home: it is dangerous and tightly controlled, and this guide does not recommend it. If you rely on your vehicle for work or care, fill up when you are passing a station rather than joining a queue in a crisis.

Baby supplies and toilet paper

Baby supplies and toilet paper vanish quickly because they are bought in bulk by households who suddenly realise they are short. The fix is to keep a small reserve of the things your household uses every week, not to clear a shelf.

Official emergency kit lists are consistent on what to include:

Store formula according to the instructions on the tin, keep it dry and away from heat, and rotate it so nothing passes its date. Never dilute formula to stretch it. Our guide to babies, young children and medical diets in an emergency covers the wider picture, and how to make up baby formula in a power cut deals with the specific problem of heating water when the power is off.

Toilet paper and toiletries are worth a small reserve because they are cheap, keep indefinitely and are among the first things to go. Official emergency pack guidance also lists rubbish bags and pet supplies alongside them, so add those to the same shelf if your household needs them¹⁹.

Alcohol and cigarettes also sell out quickly

Alcohol and cigarettes sell out quickly in a crisis, partly because people buy them for comfort and partly because they are bought in bulk. The practical point for a household is not to rely on them but to recognise the pattern and plan around it.

There is a safety dimension too. Fire and rescue services warn that fires spread much faster where there are flammable items such as newspapers or cardboard²⁰. Hoarded materials can easily catch alight if they come into contact with heat sources such as overloaded extension leads, the kitchen hob or naked flames like candles or cigarettes²¹. If you keep a store, keep it tidy and away from heat.

If anyone in your household smokes, put cigarettes out completely²². Keep lighters and matches away from children, and never leave a lit cigarette near bedding or soft furnishings. The same care applies to any stock of alcohol you keep: store it away from heat and out of reach of children.

Building your store gradually, and where to get help

The best time to buy supplies is before a warning is issued, and the best way is a little at a time. Councils advise having an emergency pack ready in advance because loss of supply can happen without warning¹. A grab bag helps if you have to leave home quickly in an emergency, or your power or water are disrupted²³.

Build your store in this order:

1. Water first. Aim for 2.5 litres per person per day³, building up over several shops.
2. Ready-to-eat food that will not spoil. Three days' supply is the official benchmark².
3. Light and power. Torches, batteries and a mobile phone power pack⁴.
4. Baby and personal supplies. Formula, nappies, toiletries and a personal first aid kit if needed⁵.
5. Documents and medication. A grab bag with any medication you need, a first aid kit and important documents, plus a torch, bottled water, warm waterproof clothing and baby care items¹⁷.

Each time you use something from the store, replace it on the next shop. This keeps the stock rotating and spreads the cost. Our emergency kit guide and getting started guide set out the full household picture.

Some households need help sooner. The Priority Services Register gives priority help in an emergency, and energy suppliers use it to identify who needs support¹⁹. If you or someone you care for would struggle without power or water, ask your supplier to add you to the register. Charities and councils can also help with food; our guide to getting emergency food help explains the routes.