Build a backpacking stove out of two aluminum cans: design is strong, reliable, and extrordinarily lightweight, burns alcohol fuels, and can be made for next to no investment of money. Boil water rapidly, deploy a 'campfire' in the middle of your house, and amuse yourself, with a stove that weighs ten grams and costs nothing.
Step 1: Assemble your parts
You're going to need:
Two empty aluminum cans and one full one. The type matters very little, although there are some bottom-brand beer cans that are simply too thin to make a good stove; this assumes a 12 oz can although obviously the 14 oz tall cans work since I'm using one.
A single edged razor blade
Some number of thumbtacks and a nail
A piece of flue tape (ideal) or heavy gauge aluminum foil
A ruler, book, and sharpie marker
Your life will be made easier by a hammer and a pair of scissors
Step 2: Mark Burner Holes
Using the Sharpie, mark the bottom of one can with 32 holes. Start with two across, then four square, eight, sixteen and finally 32; eyeballing can give good results if done carefully.
Step 3: Puncture with thumbtacks
Go around the burner puncturing every other hole with a thumbtack, then go around again to get the rest of them. Be careful in this and other steps not to dent the can any more than necessary, handle towards the top and bottom and put pressure as evenly around as possible. The thumbtacks will bend, some of them, so you'll be going through a few.
Step 4: Add center drain holes
Take the nail and pound in seven holes in the middle of the bottom in a 'daisy' pattern. These are where the fuel drains into the chamber. The full can works fine to pound in the nail but a hammer works better.
Step 5: Score a groove
Taking the book and the razor blade, score a groove several times around the base of the can, 7/8" up.