So, John is going to appear in the camp after being on his own for little over a month. It kinda messed him up, but he'll pretend that it hasn't. He's going to be the camp doctor, and I can't think of anything else right now, can you?
He created a shelter for himself about 3 days walk from the camp... he squirreled away a lot of supplies and will suggest to the camp that they go there to retrieve it.... hopefully it's still there, but there's a lot of useful stuff... but it would go faster if the camp has a vehicle.