We made one at work and it works perfectly!
We used a Coke can and user ONLY a knife to make it.
We got the instructions from 'Backcountry Living' mag. or one of the other ones like that...The same mag that has the bow making instructions in the current issue, with a turkey on the cover.....
We used it with rubbing alcohol to make char cloth!
I have also used it with denatured alcohol, which works better than the 70% rubbing alcohol, but the best results were with Everclear(while I do not drink, I bought it to clean water bottles with...It works very well and evaporates completely leaving no residue in the bottles...
The Everclear was the best fuel I have used in it...It did not have hardly ANY smell while burning(the denatured alcohol had a rather unpleasant odor to it...Which is strange considering that the can spec.ed it for restaurant food warmers...
I have not tried any of the medical grade alcohol, but I do not think the difference between 190 proof Everclear(95%) and the 98% stuff would make much difference.