>Can he fix his own car?

To a degree. Many major repairs require specialized equipment nowadays. Small maintenance stuff, sure.

>Can he grow a garden?

Half the houses on my block have a garden.

>Can he hunt or forage?

Hunting season looks like a massacre around here.

>Make water safe to drink?

Is running water through charcoal and boiling it difficult?

I'm not sure where you live or who you have experience with, but you are way off base with many neighborhoods I have lived in.