I used to watch the show Doomsday preppers. Some made sense but some were bordering cuckoo.
Some Americans have too much money and idle time to prepare for their idea of how doomsday will happen. I like those families that aim for self sufficiency. There was an episode I saw where the family was planting their own vegetable and fruits, raising livestock, and they also built a water filtration type of system. Yung cuckoo episode naman a guy built a filtration so you can drink your urine
We don't have any SHTF preps but we're always stocked up on food, more than enough to last 2 months. We have an overhead tank that would last about a week siguro in case water supply is cut. Sacks of coal for cooking too.