Hi Steve,
I posted a similar question on the old ukDis board but didn't hear from anyone who had stayed there- so I'll be keeping an eye on your thread for any answers here!
I saw the log cabins during a day at Fort Wilderness and they look like they'd be lovely to stay in. There is a small shop on site selling basic foodstuffs and snacks etc. but it seemed to be very expensive. There may be other shops etc there but we didn't see any.
If you had a car I suppose you could stock up at Walmart....
I'd also be interested to hear from anyone who's stayed there...