We stayed in the cabins at Fort Wilderness and wanted some essentials, breakfast supplies and a case of bottled water in our cabin. The groceries were brought to our cabin and put away-- couldn't be more convenient! Also was a great money saver for us. You can bring bottles of water to the parks with you, which we did every day.
Great experience all around. I emailed questions and they were answered promptly and completely. From order to the text communication about delivery everything was flawless.
We used Garden Grocer for our trip to Disney. They dropped groceries at our hotel. I highly recommend this - especially if traveling with children.