The Church of Jesus Christ and Latter Day Saints used to recommend that everyone have 7 years of food put by.

I think they now recommend 3 months. You might want to fact check that, though.

They have some excellent tips on how to stockpile food inexpensively. Remember to rotate your foods and eat the oldest stuff first.

I grew up in a family that kept a year supply of food and other items. That's just what worked the best for us. We preserved our own gardens and that really helped with costs.

Don't forget toiletries as well. I hit up CVS when the planets align and their sales correspond to high value coupons from manufacturers and store coupons and I can buy toiletries and such for 10 cents each. I clean them out on those days. Double stacking coupons there has saved me tons of money over the years.

I've noticed that many people haven't started food storage because it is so expensive, especially now. I've found some really good sites that teach you how to do it cheap(er). Hope this helps. :

Info on how to double stack coupons:

https://thekrazycouponlady.com/tips/couponing/stack-coupons-at-cvs

Backwoods Home has been one of my favorite go-tos.

https://www.backwoodshome.com/dollar-store-to-the-rescue/

https://www.backwoodshome.com/storing-dry-foods/

https://www.backwoodshome.com/building-and-stocking-your-pantry/

Several people I know who have been starting their stockpile from scratch have found this article helpful.

https://theprepared.com/blog/review-lds-food-plan/

It's geared more towards people who are slowly building their stockpile, but lots of good advice, IMO.