Three methods that I would use if it were to happen:
1) 72 hour hot packs used for shipping. Simple way to provide heat, wrap these in a small blanket and put them in a smaller temporary container with your cold blooded animal.
2)Heat up water if you can have a fire, or adequate heat source to do so. Put the water in a gallon jug and inside the enclosure to provide a heat source for the animal. The water in this method will need to be montinored closely to ensure that the water is changed with newer hot water before too low of temps occur. (obviously make sure the water isn't TOO hot when putting it in the container - *use a thermometer*)
3) Buy a generator
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1.0 Python Regius 0.0.1 Morelia Spilota Mcdowelli 0.1 American Pitbull Terrier 55 Gal saltwater reef - cycling
~Derek
_sic semper evello mortem tyrannis_