No problem! I want to bump this up to see if we get any responses. I just wanted to address a couple of your points though. Mind you, this is our first trip to WDW, but I've done extensive research and have learned a lot from the nice people on these boards. As far as Goodings is concerned, I've heard that their prices are not good and that they're actually overpriced. I've seen Publix mentioned a lot for those who do the towncar/grocery stop thing.
You mentioned a cooler being brought as carry on. I've seen many people recommend a soft sided cooler that you can fold up and pack in your luggage. I haven't gone shopping for mine yet, but I believe they probably have different sizes, I know that the stores where I live carry a variety.
I was planning on getting things like water, soda, Gatorade, possibly cereal, those tuna/cracker combos (but not for eating in the room, don't want to stink up the place), cookies, etc. I'm planning on it primarily because I have three boys who have voracious appetites (hubby too) and want to have something on hand for those rushed mornings and for late night snacks, but I do like that I'll be saving a little mulah!