I tend to agree with Rog. As we parents know, the kiddos are sponges when it comes to learning by example. I think as long as you bring up the point that you do things differently than the Scouts do he'll get it.
With regard to your son being self sufficient; how about just buying him some gear and show him how to use it as necessary? If he packs his own pack, like Rog says, he'll start to get the idea after a few trips out. He'll probably have a lot of fun cooking his own food, making his own water, etc... plus the sense of accomplishment along with your words of encouragement should make for a great experience.
My kids are both fairly young so I'm just happy they're interested in "going for a hike" at this point. They both really want to carry their own stuff though, which I find interesting, so I let them carry clothes, snacks, and water... and of course marshmallows are a top priority for them :)
Backpacking with Thomas the Train, age 2 (his pack from Little Light Gear is boxed up for his birthday this August)