No outside food or drinks are allowed in the Georgia Aquarium, unless it's just small snacks for children or special supplies for people with food allergies. The aquarium has several water bottle filling stations, so do bring a refillable water bottle with you.
Georgia Aquarium has established – and strictly enforces – a “No Weapons” policy. Leave your firearms and knives at home, folks.
You can, and should, bring a fully charged phone for photos. But if your battery dies, there's a lounge with six charging stations sponsored by Southwest Airlines on the second level of the Rotunda above Café Aquaria.