Golfer had a good idea Hawk, but they also have battery powered fans now, use like 2 AA batteries or something, just bring along a package and you should be set, if i recall they put out a pretty good stream of air and weren't all that expensive. Somewhere like Wal Mart, Target, Or Linens n Things would have them.
Otherwise you might be able to buy one of those big energizer batteries they use for flashlights and try that.
And you could go even more expensive, buy a portable jump starter, just in case.