Fire from air.
Can't beat that for survival, right?
There are oodles of different models of "Fire Pistons" from $20 to $500. There are plenty of other options, this is just one of the cheapest and best examples I could find..
Plus, I figured a lot of people would find these interesting :D
Arbor Scientific's Fire Syringe compresses air into a smaller volume which is a classic example of how rapidly doing work on a gas results in an increase in temperature. Once you have inserted a small piece of combustible cotton fiber into the syringe piston, a quick firm stroke on the piston handle produces a flash in the chamber which burns as long as there is air present. The Fire Syringe comes with a standup base, combustible fiber pack, 2 replacement O-rings for the piston, and Arbor Scientific Data Sheet with directions, background, and part info.