The Formosa Gardens shopping center has a grocery store, but I think the Super Target a few blocks west has better prices.
I would go to Giordano's at the Formosa Gardens center for dinner. Get a gift cert from restaurant.com to save $25 off a $50 bill, or $50 off a $100 bill, depending on the size of your group. Get an extra pizza and have it for left overs later - they heat up great in the oven. It takes at least 30 minutes to cook the deep dish pizzas, so call them on your way from the airport and they can start your pizza order so you don't have to wait so long. After dinner, take your leftovers to your rental, and check to see if you will need to purchase paper towels, dish soap, TP etc before going grocery shopping. The Super Target is less than 5 minutes from emerald Island.