+1 on on the mini-Trangia. Nested inside my Snowpeak solo cookset, it works fine for occasional or emergency use. The pot, lid and windscreen it comes with work fine, too. But the windscreen is a bit wide for the Snowpeak, so you need to either bend in the top a little or use a different stand. However, a good windscreen of some sort is required.

I like it because it is dead simple, with no moving parts and nothing to clog or break, alcohol is safer to store and transport, and it is cheap, light and small.