and who really wants to hunker down for 25 years?
The LSD church used to recommend 1 year’s worth but are now up to 2 years. Three months is a good start. Then you can go for a year and then two years etc. Store bought canned goods last indefinitely, especially if you avoid pull top cans.
If one has a few grand to blow, they can be stocked up quick with the LTS foods but you might want to try things before you stock up years worth. Would suck to open something after the shtf only to find you don’t like it.
Last time I checked the LDS foods purchase site, a lot, if not most of their goods were out of stock.