Stopping on the way from the airport is a great idea. There are two stops possible: Hurley's In Grand Harbor at the mall and the second is Fosters in Savanah at the Countryside Shopping Center. Both are fully stocked Grocery stores with excellent availability of just about anything you could want. Both have delis, large produce depatments and bakeries. One thought is buy your perishable stuff across the street after you have checked in, if you will be getting to Morritt's much before 3:30. It is not uncommon to not get your unit until after 4:00. So the stuff that needs to stay cold needs to be given to the front desk for storage or left in the car when it's hot out. We always wait to buy the cold stuff across the street.
BTW if you want anything that the Fosters in Morritt's Plaza across the street doesn't have ,just ask them for it and they will have it for you the next day.
All three locations mentioned have Liquor and beer stores, so no problems anywhere for that.
If you are beer drinkers, the Cay Brew Brewery is on the way to Morritt's just past the Grand Harbor Shopping Center. Beer is the cheapest there, but you gotta like Cay Brew or their other offerings.
Enjoy your trip!
Mahlon