Guns, ammo, food and fuel are good assets to have in a collapsed economy.
Depends on what you mean by food. If you have enough time, food can be multiplied. One potato, properly handled, can turn into a field of potatoes. One walnut, properly handled, can turn into a forest.
I think the idea behind an apocalypse bunker is it will remain unsafe to go outside / farm using solar power for a few months to a couple of years but not forever.
I agree. You have to start farming at some point.