From OKW, you can get there by going out of the resort and turning left on Community Dr, then left on Bonnet Creek (at the light) to Buena Vista Drive (2nd light I think)._ Turn right and go under Epcot Center Drive (536) and take the entrance ramp going East toward Kissimmee._ On 536, go about 2 or 3 miles to the first major intersection (first light also i think) and take a right on 535. Go about 2 miles and 535 will dead end into 192._ Publix #1 is one your left._ If you turn left onto 192, Super Walmart is on your right about 1-2 miles or so.
From BW, leave the entrance and turn right on Epcot Resort Blvd._ Turn right on Buena Vista Drive and then go sourth (away from the parks and toward 192) on World Drive._ When you get to 192, go East and follow 192 about 4-5 miles and you will see Publix on the left where 536 joins with 192._ Continueing on 192, Super Walmart is a mile or two more on your right._ NOTE:_ THERE ARE DEFINITELY A COUPLE OF PUBLIX CLOSER THAN Walmart.