Well usually when people refer to someone as a prepper its the specific type of person that is buying hundreds of guns, tons of dehydrated meals but still living on city water - like they're preparing for a disaster movie but not anything real. Specifically the idea that you would be able to stay in place, with all your hoarded disaster crap, during the end of the world is kind of funny.

Do you know of any preppers who buy guns and rations but don't have a plan for water?

OK steelmanning you, certainly a lot of them are way more interested in gun collecting and making beef jerky than other aspects.