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.
Freeze-dried food is nothing new. As early as the 13th century, the ancient Quechua and Aymara people of Bolivia and Peru pioneered a form of the process by exposing potatoes to the freezing temperatures of the Andes overnight, then drying them in the sun. In 1937, Nestlé used industrial technology to create the world’s first freeze-dried coffee, and in the 60s and 70s, the US military shipped freeze-dried food rations to the troops in Vietnam.