This is a penny stove that I've built. The body of the stove is a tuna can. From the other penny stoves I've seen, this one is the cleanest, simplest, and most professional. Go ahead and make variations to the stove you build. The stove can boil water in a medium size pot in around four minutes.
You will need:
1 empty tuna can
1 hole punch (single)
Some sort of clean burning fuel (Rubbing Alcohol, etc)