Warm drink

A hot beverage is recommended to help warm up a person who is in the EARLY stages of hypothermia, it is dangerous to give hot liquids to a severe hypothermia victim.

Its easy to stick a thermos full of hot water in the hatch and keep a few packs of hot chocolate, tea, instant coffee, soup, or whatever you like in your first aid kit or lunch box.

Hot water is nice because it's so versatile.