I've known a few prepper types. They had plans for escape rooms, a significant cache of weapons, some ammo, and a few MREs in the closet.
Nobody had more than maybe a few liters of water per person in the home, and when I asked about an escape plan (e.g. there's a fire, get out and meet at John's house on the next street over) they looked at me like I was insane. Oh, and of course they're all in fairly bad shape.
In my opinion, most of the "prepper" stuff is about fantasy role playing. I see it as related to the "middle aged man porn" we see lately in the form of the Taken franchise of movies. It perhaps it gives a feeling of smug satisfaction in a chaotic life. You're angry that you were cut off in traffic on your way to a job that might have layoffs tomorrow, but at least you can tell yourself that when the apocalypse comes, you'll succeed while that jerk will be fodder. Sort of a tough guy variant of the classic "ass pennies" comedy sketch.