Say what you will about Mormons, but they take the idea of local stockpiles amazingly seriously. It rises to the point where they subsidize stores selling bulk food product direct to customers, at a scale that otherwise you'd need a Sysco or commercial restaurant license in most places to get access to.

Source: https://www.churchofjesuschrist.org/life/home-storage-center... (In older literature & analysis it used to be called the LDS Cannery or LDS Dry Cannery, but I guess they recently rebranded it.)

Not required. It's recommended by the church leadership though to have a garden and to have a years supply of food storage if you can. I'm not a Mormon but appreciate it as a good idea.