Esbit is what I use for caches and kits that are tucked away in anticipation of emergencies, although for short term use, I have no problem with isobutane canisters which are super reliable, lightweight, and easy when used with the appropriate burner head. I understand isobutane is lighter than air and will disperse, unlike propane, which has the undesirable characteristic of pooling in enclosed spaces.

A little bit of handcleanser helps the esbit tab to get going....