Wrap the hot bottle in a cloth towel
Or, do what I did when we ended up unexpectedly with a hatchling and no extra equipment - treat the water bottles like a baby bottle. I used warm water, not hot, and put my wrist to the bottle. These stayed warm for a few hours, and the hatchling just curled up on top of one of the jars. Not ideal, but that got him through the time it took to ship a herp-stat and UTH. Tub was on the kitchen counter, so I switched out bottles whenever I was in the kitchen.
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