I can't see how I over looked this living in Florida... But what should I do with Loki should I have to evacuate for a hurricane?

We take the dog with us, it's a given. My mom said today we'd take Loki too, since he can be kept in a storage box.

But heat wise, what could I use to keep him warm? I was thinking about just using warm water in small bottles, possibly getting heat packs for if we evacuate because my family won't keep a hotel room warm enough for him...

So, what would be a good plan? I have researched on the web for hurricane plans, and can't find anything. Other than "He'll be ok without power" I know that much... And that's fine for here, because it does get hot and humid after a tropical storm/ hurricane... But in a hotel room thats VERY cold, he won't be ok.