Or you could go to the shop at BWI or YC/BC if you're in EPCOT as they have food items in the refrigerated section. I remember getting cheese and sliced meats and crackers (and mini sparkling wine bottles) once when staying at BWI and once at YC so that we could snack late at night. Most of the hotel shops will have a food section, especially the ones that have DVC villas. What specifically they will have I couldn't say but they definitely will have something.