I prefer the methanol available in most paint store miscellany. I have also used gas line anti-freeze (yellow label burns cleaner) and Sterno fuel (the liquid). Grain ethanol should work, though I haven't used it (if you can get potable then you could have a party, too!) I use about 1 oz. to boil a pint of water. To get best efficiency requires good windshield. I make my own with 6" alum. flashing with holes punched around base with paper punch.