Use either gardengrocer.com or wegoshop.com
Both great services. They do both charge about $14 or so for delivery, but you don't have to take the time to stop and shop or pay for the car. They bring the stuff right to the resort. And you can tip them if you wish. If you don't want to wait around for them to arrive, you don't have to. Bell Services will take the packages for you and bring them up to your room when you call down to them.
Much better than renting a car,driving to the store, shopping, driving to the resort and then returning the car....if at MCO, then taking DME...or if to the Dolphin and then getting back to Epcot or DHS and to your resort. Take DME to begin with, have a grocery shopping/delivery service get your stuff and bring it to you.