I prefer Esbit tabs to Sterno for a durable, storage capable fuel source. Even better is a canister stove, which will easily boil water in something like three minutes or so. There are all sorts of burners available for canisters but I stick with my old faithful Pocket Rocket. it does need a wind screen occasionally, which is easily improvised.

I usually have Esbit tabs packed away in my kit. There are times when they are just what you want.