To Consider An Alternative Fuel Source IS Good Medicine, but don't forget about the Obvious Fuel,...Gasoline !....At some point there will be abandoned vehicles (and bodies) littering certain areas, because they couldn't move, due to stopped-up , clogged roads....Ergo .Fuel Source....You need a portable hand crank pump (Oil Grade) with rubber flexible (Oil Grade again) hose (approx 1/4 " ID and about 5ft in length) and small containers to siphon the gas into,...I have one ready to go, and I put it together for under $50.00 !!.......