I get the feeling that a significant number of people wish to prep for stylishly themed survival scenarios.
Here’s something to consider... on a globalor national scale catastrophic event, only the poorest nations will manage the disaster well. Why? They already know how to survive with very little as they live it daily.
The takeaway? Learn more primative tech.
That’s why you never read stories like this where the Amish are incapable of dealing with a sudden deep freeze. Heck — they’d be fine keeping themselves warm just by sleeping with the cows.