We always suggest bringing cereals, coffee, snacks etc from home.
There is a small convenience store in the Harborside at Atlantis lobby for essentials - milk, bread, juice, eggs, butter, snacks and sundries.
You can ask your taxi driver to stop at a market on the way from the airport. There is also a grocery shuttle that leaves from Harborside at Atlantis during the week - see shuttle information above.
The shops across from Atlantis Resort & Casino are fine for souvenirs. Prices are comparable to those in Nassau.