Does anyone have any suggestions about teaching preparedness to young kids?

My son is 4 yrs old. We've always prepared FOR him but have recently begun preparing WITH him, at least on a small scale. We've started teaching him about being prepared and what to do in case an emergency should happen.

We talk about and practice things like in-home emergencies (fire, power failure, etc...), as well as out of the house emergencies (getting lost, snow storms, car accidents, etc...) We often go on hikes and he's got a backpack that includes some very rudimentary stuff like a whistle, flashlight, orange garbage bag, water bottle, granola bar, extra sweater/jacket and socks, etc.

We don't want him to be scared, and there's little chance that he'll be alone in the near future, so we're sticking to the basics that are age appropriate right now.

Any ideas?