I was checking around and Wal-Mart sells several that hold a lot of power. Mine is 12,000mAh and I am seeing some 20,000, 50,000, and up. They do a good job at keeping cell phones working if the cell towers are working. I’m also going to get a single burner Propane camp stove. At least we will have coffee and can warm up soup. LOL
Check around for one of the classic Coleman 425C stoves. I got one for $15 used and run it on straight 87 octane no alcohol gasoline (as I do with their liquid fuel lanterns i’ve gotten). I just cooked for 20 on the one I have.