You must have more than a few magazines or shots worth of ammo for any firearm you are going to depend on for a protracted crisis. Additional options for weapons are things like large “riot-cans” of pepper spray, knives, machetes, axes, fists and feet. Medieval or primitive weapons like swords, spears and bows require a great deal of training and practice to use effectively, and while they do not have a dependency on ammunition, your time and effort is likely better spent learning gun and hand-to-hand skills. If you are already proficient with such weapons, more power to you.
Though its light weight and long shelf life are ideal for navigating harsh conditions, freeze-dried food is probably most famous as a cultural curiosity: Like many Americans, I discovered it in a museum gift shop, gawking at the styrofoam-like ice cream that astronauts used to have for dessert. More recently, I encountered it at a disaster preparedness convention in Raleigh, North Carolina, where smiling, gray-haired preppers manned tables piled with plastic bags full of vegetables, meats, and stews.