Keep doing what you're doing.
Read about Garden Grocer on many Disney fan sites online. We decided to use them for delivery this trip to the Cabins at Fort Wilderness at WDW. It was such a great experience. Prices were the same as back home and everything was already put away in the refrigerator when we arrived. We wish we would have done it every vacation before but we will definitely use GG every vacation from now on. They are the best!
I will use Garden Grocer for all of our return trips to the Orlando area. Their website was easy to use, our order was delivered on time and perfect. It was nice to be able to save some money on essentials like water and snacks so we could spend it on other things while at Disney!