Instructables user wartellc made his own Fire piston in about 4 hours. I had never heard of one of these before, but the concept is pretty basic, I like it. I don’t have any of the tools necessary to make my own, so I’ll probably just buy one, it’s only $25 on Amazon. However, the char cloth that is necessary to really use it, that I can make according to this instructable.
Char Cloth is dead simple to make, take an old, 100% cotton t-shirt, cut it up into small pieces and put it in a sealble tin container. Punch a small hole in the tin, and place it on a fire/ember. When no more smoke comes out of the tin, you’re finished.
Now you’re ready to use your fire piston to make some fire!