Wouldn't propane be cheaper?
Get a big BBQ propane tank.
Then, at Walmart or some hardware store (home depot, Reno depot), they sell this kind of hose. One end goes to the tank. The other end is for the small attachable things. I plugged a propane torch head.
Clean burning propane!
isopropylic alcohol is too expensive.
methanol is less expensive but still too much.