[link to www.amazon.com]

For water storage. There are several brands/options. Holds up to 100 gallons. You can always take a sponge bath, but you need water in emergencies.

Emergency space blankets, as others have said.

Fortunately, we have a wood stove and that is a godsend! But I see you are an apartment dweller, so not so feasible in your case.

Best to you!