Those soda can alcohol stoves really do work. And you don't need to get fancy with sealant or anything like that. Tons of plans on the Internet. I have made many different models..but the simpler ones are easier to make and most of them work as good or better than the more complicated ones. They will even work without the penny. I used nothing but two cans and a Swiss army knife to make my favorite one. There is even a company that makes these out of titanium or something that you can buy for like $20. If I can remember it I will post it. They are nice because they have legs and a pot stand but still weight about the same as the soda can ones.
And Alcohol is the best fuel. Burns clean and turns into gas easily which is what you need for these. It's the gas that is burning, not the liquid fuel.