Walgreen's is much closer and they have basics like water, milk, bread, etc. for reasonable prices. They also have a liquour/ beer store, if you need anything like that. The last time we flew into Orlando, we used Tiffany Towncars for transportation, and they stopped at a Walgreens for us to shop.
tiffanytowncars
A cab ride shouldn't be too much. Last year, we drove. We stayed at CBR, and there was a Walgreens at the next exit (I think it was exit 64, with exit 67 being for Epcot). The drive only took about 10 minutes, with most of that getting out of CBR.