You could try Bozburun, Orhaniye, Selimiye all on the Bozburun peninsular or Datca. All are mainly resorts geared to the Turkish market & yachties. Not sure there is enough in any of them to keep you going for a week, & other than Datca, there aren't any major supermarkets. Also, you may have to find your own way there on the dolmus from Marmaris.