See the Danish Veterinary and Food Administration's three tips on how to prepare for a period without electricity or water

Follow the Danish Veterinary and Food Administration's advice on how to prepare for a period without electricity or water

The authorities recommend that you and your family can survive for three days if a crisis strikes. Therefore, make sure you have a stock of food and drink for three days.

When you are prepared and able to take care of yourself and your loved ones, the authorities can focus their efforts where the needs are greatest and work to normalize the situation.

See the advice here