You'll love the cabins!
Don't have help on what to bring, but if $$$ permits, do a town car from the airport and have a grocery stop. load up on food so you can eat 1 or even 2 meals a day in the cabin. The towncar shouldn't be that much more than transfers, and the $$$ you save eating at "home" will save you even more $$$ in the end.
If you all can't fit into a town car, check into renting a car for your trip and stoping on the way for food. Also, you can use the car to drive around Ft. Wilderness, saving time and hassle with the loop buses, and also you can drive to the parks, giving you a quick get away instead of waiting for busses/boats.