^ This guy Minecrafts.

I would also add:

If you don't already know how, learn to use a map and compass.

Befriend a Mormon. A lot them have 2 years worth of food storage.

People will still want entertainment. Books, magazines, games, soccer balls, football, etc can keep the boredom down. If you're going to be inside for while with a group, have tabletop RPGs and war games avaliable.

Have a lot of extra toothbrushes and paste. No one want stinky breath. Floss, picks, and dental wax is imperative if you can't get to a dentist.

High proof Alcohol / Whiskey. It's valuable as an antiseptic and coolant, and fuel. And anesthetic if really needed.

^ This guy Minecrafts.

I would also add:

If you don't already know how, learn to use a map and compass.