Sterno stoves can be obtained as camping supply places. An alternative is to construct what is known as a volcano stove, a small, wood fired 'stove' that can be built from a metal coffee can (#10) and a couple soup cans. DIY guides to make one are all over the internet.
My husband made one of those. I forgot about that. I think it made the move. He hasn’t organized his building yet because he’s working all the time! He could set it up for me but I’m not sure if I would know what to do with it. I think my family needs to practice some alternative cooking on the weekends until I get used to not having all the modern conveniences.