Thanks everyone

If I would use ethyl alcohol I can use sterno which is fueled by alcohol and it is ready out of the can. However, it is only found in large stores with camping or barbeque sections.

I am mostly interested in butane for availability of refills in any store, and Esbit which is solid (won't spill or be affected in hot weather ).

Esbit fuel is not available around either, but I may use the esbit stove with coals smeared with petroleum jelly.

That may work. LOL