Cheap,
Sterno is about 60 percent water. Carry a small bottle of denatured alcohol along and when the sterno runs out, just pour a little denatured alcohol into the can and keep using it. Later, you can stuff a little fiberglass insulation in the can for a wick.

My first "ultralight" stove was a folding tripod that held a small sterno can and supported a 2.5 cup aluminum pot. A 1" high chimney fit on the sterno can to increase the efficiency. It was a pretty good cook set and weighed about 8 ounces. They used to air drop these to lost hunters and hikers in the old days.