https://enewspaper.latimes.com/desktop/l...5f-80769f5936e7You want to read article 54 in this edition of the LA Times, which discusses SOS Survival, a business which provides survival gear and training in the LA area.
The worldwide market for survival stuff, 75 billion in 2017, is projected to rise to 423 billion by 2025. That is a lot of Ritter's knives!!
The article makes a favorite point - canned goods are more useful than freeze dried goods, given that FD items must be hydrated, whereas canned goods do not, saving available water for direct ingestion. the article does confound FD items with MREs (meals ready to eat). MREs can be eaten right from the can, with no preparation whatever and do not require added water.
I think that for most households you don't need to run out and buy a lot of stuff. It's more about organization, propositioning, and planning than anything else. Training and skills acquisition are also critical.