I don't see the question I dodged, honestly, but doesn't matter, I'll answer the last 2.
Sell water to the runners who can pay for it. Most of them can. The ones who can't die unless charities help them. Sounds harsh but that's just how it goes.
The only point I see you making is that the worst case scenario sucks. Of course it does, but America is nowhere close to that. Everything's okay, except for the lazy and the stupid.
If you really can't create any jobs, which is a very hypothetical situation that has nothing to do with America, you could go to other countries where they have jobs, or supply yourself. The only reason no one does that is because there are jobs.
So yes, hypothetically, you're right, but in practice, almost no one has nothing in the United States. If you have nothing and don't get anything you die in a few days. That's not happening a lot in the United States, if at all. I understand your theory but it's just not happening.