Thing is, if it comes to something like that, everyone will suffer. This will be no panacea. And it will get bad here too. Lets be frank, It’s kinda like making plans to survive a nuclear war.
I'm thinking worse. I suspect the government will get involved in trying to take the supplies from those who prepared and distribute them to their armies or to the people who didn't prepare.
I think the whole apparatus of government will be turned against those who try to maintain some sort of independence.