you could (depending on what you are cooking) go with the cheapest cook stove ever made that works amazing for around 15 min (probably a bit longer, not sure) at a time I recommend the Penny Stove.
http://www.instructables.com/id/How-to-make-a-mini-stove-penny-stove/
that link has one part you dont need, skip the insulation.
I used one of these when power was out for several days, one roughly 2 ounce charge of denatured alcohol would cook a 3 egg omelette and boil enough water for a large hot coco/coffee/tea with no problems.