Potassium permanganate
KMnO4 is often included in survival kits along with either glycerine or a glucose tablet for making fire. The glucose tablet can be ground up, mixed with the potassium permanganate and it will burn if rubbed. It can also be mixed with anti-freeze from a vehicle to make fire. Doing this can be dangerous and should be done carefully by dipping some paper into the anti-freeze and then adding a small amount of potassium permanganate. It can also sterilize water and wounds so it is useful in a survival kit.