You may want to hire a towncar to get to WDW from the airport and have them do a grocery stop. I think they do this for a 30 minute stop at no extra charge. Beyond that, many of the WDW resorts have a small and very limited selection of groceries in the resorts gift shops and there is "Goodings" right outside of DTD -- very pricey though. There is a wal-mart and a Publix not too far away from WDW but you would need to find a way to get there without a car since they're not within walking distance.