-Potasium permanganate and glycerin-
Potasium permanganate is an anticeptic powder and glycerin is used to treat ear infections. You should cary these items in your first aid kit. When these two substances are combined they burst into flame. If portability is an issue, its a good idea to carry items with multiple uses.
from (
http://www.freewebs.com/barksoup/survival.htm )
The key word above is 'burst'...
Have a good 'Fathers Day' Dads...