On our way from the airport to WDW, where is the best, least expensive place to shop for pop, diapers, snacks, milk, wipes, etc? Also, please help with directions...we got lost last year and ended up at some K-mart, I don't even know where we were! Also, a styrofoam cooler, too. We are renting from National so if you can take us right out of their garage and give specific directions. Thanks.