I have enough shotgun shells to last me some time, I pick them up when they are on sale. The storage ideas here for food supplies are great, but you also need to get your powder dry as well. I keep my ammo in Military ammo cans I have an advantage I can get them free on a regular basis. In addition the keeping ammo dry they also work great for keeping hardware (screws, nails, duct tape) dry.
Food and water will be a priority in a survival situation, but survival skills are nearly as important.
I have supplies and skills to barter with, as well.
You’d be surprised at how few people have any idea about canning or sewing.
Mr. mm can fix about anything, but especially heating systems.....