If the house is really cold (you'll probably have doors open while going in & out) you might want to use hot water in the bottles. Being in the bag will protect your
snake from contacting them, just make sure they don't leak. You can also put a little towel around them.
I've actually had to do this for a long power outage (from an ice storm), for days. Hot water in large jars in large ice chests with 2 or 3 bagged snakes in each actually
kept them warm -a balmy 80-82*- for 8 or 9 hours, when I changed the water again. All my snakes were fine from that "adventure" too. Most of mine are colubrids,
but I also had a large boa then & still have a small python.
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