I have a few redundancy items myself, mainly around preparing for an ice storm:
1: I try to keep a week's worth of dry food in my RV as well as some jugs of water, all in tight fitting plastic or metal containers to discourage/deter critters.
2: I try to have a Buddy heater and a few 1# propane bottles. The Big Buddy heater will run 2-4 hours on two bottles, producing enough heat to warm a rig, even with two windows open for circulation.
3: Multiple CO and smoke detectors, all on separate batteries, go without saying.
4: I take enough gasoline to fuel my generator for a few days. This way, if propane runs out, I can still run a space heater.
5: I take multiple cellphone external batteries with me. That way, if I'm stuck, I can at least read a few books until the ice clears up.