I've been using these aluminum can stoves for a few years now, and there are a few things I've learned.
1) You can use ethanol (ie, Everclear), or 'denatured' alcohol (that's ethanol which has been 'denatured' with methanol, ie made non-drinkable so it is exempt from federal taxes), or rubbing alcohol (as long as there is no more than 30% water and no other ingredients such as Witch-hazel). When using rubbing alcohol it will take longer to boil a given amount of water, and the can will quite often need to be emptied of water before refueling, but it does work in a fix. Note: I always use