Anything electronic (currency or otherwise) will be useless when the grid goes down.
Yes, you can’t eat something that is not there.
My ancestors survived horrible times. They came to this county in the middle of no where, in the Big Nothing, to be left alone. That was in 1889. (the county was divided up in 1885) They were not near stores, banks, civilization. Some of us are still here.
Could we go back to that? Not quickly.