We ordered some things from GardenGrocer.com, but I also brought snacks (Rice Krispy Treats, Chewy Granola Bars, Individual Bags of Peanuts and those little Cheeze-it things, and fruit snacks. The kids were pretty happy with those, and if you have the dining plan, we did not eat nearly as many snacks as I anticipated.
From Garden Grocer, I ordered water, softdrinks (we don't drink coffee), juice boxes for the kids,milk, yogurt, bananas, apple slices, 1 individual cereal bowl for each of us, and lunchables for the kids (2 each). Two of them ended up sharing a lunchable one night, but I ended up taking the rest home with me...we had an 11:00 am flight, and as soon as we got on the plane, all were hungry, so I was glad to have something easy and not very messy to take on the plane. I had gotten a Mickey waffle for them as we left the resort, and they ate that at about 9:30 when we got to the gate, but were then hungry again later.
I think that the minimum order was $50, and delivery was $12.00. We used the groceries mainly for breakfast so we didn't have to get out as early and could go straight to the park, and then again for evening snacks when we at dinner at 4:30 or 5:00. We were then able to feel like we were really treating ourselves for our snack credit each day (the kids really liked the Itzakadoozie popcicle thing, and also the slushie type drinks).