There are numerous Hypermarkets in the "touristy" areas but this one is a bit closer..about 25-30min walk... but obviously not as large.
From the airport, follow the road to Marck Village. Cross over the "square" and bear right . Follow this road for about 200m and turn right at the end. (You are now in Marck Town). Take first main road left and Supermarket is 20-30m on right. A reasonable supply of beers and wines await you......enjoy