I regularly stock up canned food in my pantry.
Fruits, ravioli, corn, chili, etc...
Its saved me boat loads of money over the years.
If an actual doomsday happened, I'd be dead within a couple of months lol.
There would be millions of people heading into the Sierra Nevada foothills because of access to water and you would not wanna go there with no ammo.
Also animals don't grow on trees. Millions of people hunting for game means competition and I doubt those people will be shooting just game but they'll be shooting each other.
Ideally you wanna move to a walled off and small self sustaining community where everyone works with each other. You do not wanna move out into the wilderness by yourself.