Make sure you have:
A support network of people in your area who can band together if/when it happens.
Plenty of food, WATER, medical supplies, etc.
Sufficient ammo and firearms (but really, don’t go overboard)
A plan for what to do when it happens, worked out by aforementioned support network. Know what’s defensible, where people need to congregate to live, and what you’re going to do about outsiders.
I’m pretty far out in “flyover country”. We’re about halfway off the grid on a normal day.