You will need something to barter with. Junk silver and gold is good. Something that is recognizable.
Your ammo will be worth something.
But more people will have guns than food. And some of us will have both. We will want to barter rather than shoot at each other. In fact, working together will can do more than apart.
Concur on the working together but as a hunter and fisherman, food and water is abundant if you know what you’re doing. Money i.e. gold, silver etc is useless when water, fuel, food and even alcohol & clothes becomes far more valuable bartering in a collapsed financial market.
A lot of folks seem to think gold etc is the end all but I’ll take common sense and the above and think I’ll do fine.