The ceramic filters in the Berkeys can filter lots and lots of water before they need to be cleaned. Thousands of gallons, as I recall. Also, they come in several sizes, so you can pick one to most closely fit your needs. I bought a “Big” Berkey along with a complete set of spare filters. It is in my supply room along with my FD supplies, and back up emergency paper supplies.
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.