One must prepare for water. It'll be the first to go and It's second only to Air. You need clean water for
>Drinking
>Cooking
>First aid
>Hygiene

You need to aim atleast
>2l in survival kit
>500l storage in apartments
>2000l in small homes
>5000l in large homes

If you have proper filteration methods you can count all the water potable : suitable for drinking.

Each person needs atleast 5l water daily for survival. Calculate on based of that.

I'll continue in comments

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