Vodka
Any kind of alcohol is going to be considered an invaluable resource when SHTF. Vodka, however, is a morale booster. You can cook, clean, and barter with it. Additionally, vodka can be used as a mouthwash to clean teeth or dull the pain of a toothache. Dab some vodka on cold sores to heal them quicker. Blisters can be sterilized with vodka, as well. If you are somewhere with mosquitoes, some vodka on the skin will keep them at bay.
