There's a whole subculture called survivalism (or prepping) [1] dedicated to that kind of thing. You may want to look that up.
You also may be interested in the article "Doomsday planning for less crazy folk". [2] It has been previously discussed on HN [3], and it's also been expanded into a book titled "Practical Doomsday". [4]
I'm personally advocating for tighter border controls. It has the immediate effect of helping with stagnating real wages, and might also help with the contingent problem of climate migrants.
He also had a pretty popular post here a while back about prepping for doomsday [1], interesting read.
[1] https://news.ycombinator.com/item?id=15110850