If you don't have a car, you have a couple options. You can order from someplace like Garden Grocer or wegoshop, and have it delivered. You can also go to the Hess convenience stores on property (the easiest to get to from any resort is the one across from DTD Marketplace, but there's also one near the Boardwalk resort, so you could take an MK bus back from the Boardwalk and walk to CR/BLT).