How Much Emergency Water Should You Store at Home?

There is no single perfect number of litres for every household. The UK’s Prepare campaign explicitly says emergencies vary in duration and people’s needs differ. Its current guidance gives two useful benchmarks.

The UK guidance

The Prepare campaign says a minimum of 2.5–3 litres of drinking water per person per day is recommended for survival, citing World Health Organisation guidance. It adds that 10 litres per person per day is a more comfortable allowance because it also provides for basic cooking and hygiene.

Extra water may be needed for babies, medical devices and pets.

What does that mean for a household?

For two adults over three days:

• drinking-only minimum at 3L each per day: about 18 litres
• a more comfortable 10L each per day: about 60 litres

For a family of four, those numbers double. This is why it makes sense to build a supply gradually rather than suddenly filling a trolley with bottled water.

Start with drinking water

If storage space is limited, prioritise safe drinking water. Cooking and hygiene requirements may be managed differently depending on the type of disruption and official advice.

Rotate what you store

Follow the storage instructions and dates on commercially bottled water. If you use refillable containers, choose containers designed for potable water and follow appropriate cleaning and storage guidance. Avoid improvised containers that previously held chemicals or non-food substances.

Do filters replace stored water?

No. A filter needs a source of water to filter and its capabilities depend on the product. During a local water-supply incident, authorities may issue instructions such as boiling water or not using it for drinking. Follow those instructions rather than assuming a household filter solves the problem.

Build the supply over time

A practical approach is to add a manageable amount of water during normal shopping until you reach your target. Preparedness is supposed to reduce stress, not create a rush on supplies.

Remember special requirements

• baby formula
• pets
• medicines or medical equipment requiring water
• people with higher hydration requirements

Where should it be stored?

Choose a cool, practical location where containers will not be damaged and where the weight is safe for shelving or floors. Large volumes of water are heavy: one litre is approximately one kilogram.

A sensible Global Cry target

For a household starting from nothing, first build towards three days of drinking water. Then decide how much additional cooking and hygiene water is realistic for your home, based on space and household needs.

Source: UK Government Prepare — Get emergency supplies.

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