I guess I'm addicted but really don't like to sleep without my machine.

I just got back from a one week camping tour from Toronto to Montreal and simply planned ahead and booked an electrical campsite each night. It took away some spontaneity and was a bit pricey for electric & reserved campsites but worked out well. I took 30' of light non-grounded extension cord (the cpap only has two wires) and ran it into the tent.

There are batteries available but they only last one night and need to be recharged anyway. Still might get one to restore the spontaneous thing.