IMO, for your situation (if your budget allows), Everclear 191proof alcohol is the best you're gonna get. Burns hot, food grade, and has multiple uses (first aid, antibacterial, etc.) Second best would be Sterno. Or, buy some bottles of gelled alcohol, what they use for the burners in hot buffet catering. Pour it into a cat food can or similar and you got a homemade sterno can.