Gary. You're going a little OTT on this one.
None of that stuff will happen. If it were to, it would be the end of the world and I'm not sure I'd want to live in it. Way before we reach your point the US military would be robbing and stealing from other countries to feed citizens at home.
Then martial law and rationing (yes, even with your "freedom"). And if that failed it would be all out anarchy.
If that happens, fresh food and water should not be your concern. Your concern should be the very real fact that me and some mates could break your door down and steal it from you.
The nuclear option will be extended well before we start living in the horror world you are so busily preparing for.
This is America, after all. And while it pains me (an Englishman) to say it, if it goes to pot here, it goes to pot everywhere.
Personal responsibility is BS. But it is a good way of lining the pockets of stores that feed off of your fear. But the Government will be along way before then.
Keep a couple of tins of tuna for the odd day you might lose power. Not crates for the end of society. That will never be allowed to come.