And you can always take a look at the Debs' site: http://www.allearsnet.com/btp/grocery.htm
This is in the "Beyond the Parks" section, under the "Grocery Stores in the WDW Area" heading.
Directions to stores aplenty!
Have a magical trip,
Q
There is a super walmart on 192 about 2 miles east of vineland road (which is well marked), or, about 6 miles east of I4 on 192. Its on the S side fo the road. Maybe someone else can be more specific, I don't recall where the airport is exactly (I wanna say sameron and bell-line??)