First, checkout this post http://www.backpackinglight.com/cgi-bin/backpackinglight/forums/thread_display.html?forum_thread_id=8815
Great ideas on that post. Also, do a YouTube search for bud light alcohol stoves, you will find a ton of info. I have made about a dozen from bud light cans, and given them out to hiking buddies, all use them now. This weekend, I made a tiny version from a <2inch diameter hair mousse can my daughter had pitched in the recycle bin. With a small aluminum pot, it boiled 16 oz of water in just under 6 minutes on an oz of denatured alcohol - and boiled it for almost 10 minutes. Amazing performance, and fit in my pocket it is so tiny. I plan to cut up all the aluminum bottles my wife and daughter pitch, great fun.