It’s almost hurricane season. I live right on the coast so I’m nervous about power going out. I live in a condo so I’m sure it’ll go out. I have hand warmers. But that was for winter, if the power went out.
Food get him used to pellet food if he isn't. Water, the hand warmers will still work if needed to help keep temps up some. Emergency enclosure like a tote box for if you have too evacuate and put in that a light, heat source, bowlsand the other things mentioned
When the weather forecast calls for harsh patterns, withhold food (not water) for a day or two until the storm passes. This will help reduce your worry that food is fermenting/decaying in the digestive organs while temps may be irregular or low.
If you can swing it financially, search for small emergency batteries, or solar panels, or generators. Then you can power your habitat(s) and possibly the fridge.