Water supply failure

If anyone is in danger, call for help first. UAE numbers:

What to do now

Check your water supplier's website for updates on service in your area.
Save bottled water for drinking, cooking, handwashing and baby formula.
Under a boil notice, bring water to a rolling boil for 1 minute, then cool and store covered.
No way to boil? Add 2 drops of 5 to 9% unscented bleach per litre, stir and wait at least 30 minutes.
Filter cloudy water through a clean cloth first, and double the bleach dose.
Boiling does not remove chemicals. Under a do not drink notice, use only bottled water.
Skip fridge ice and water dispensers. Brush teeth with bottled or boiled water.
If toilets cannot flush, line the bowl with a bag, cover waste with sawdust, and seal it.

UAE numbers source: u.ae. Steps summarised from official sources listed on the full guide.