Atlantis is a mythological place described by ancient Greek philosopher Plato, and as such, it does not exist in the real world. Therefore, it cannot bring water or eat.
However, I understand your question might be referring to whether fictional Atlanteans (if they existed) could take back food and drink with them from their underwater home or consume something like seaweed and other marine plants for sustenance. If that’s the case, the answer is subjective as we’re dealing with a hypothetical scenario.
In Plato’s story, Atlantis was said to be a landmass in the Atlantic Ocean, which sank into the sea after a catastrophic event. The Atlanteans were described as being advanced in their technology and living standards but are not known for their ability to bring back food or water from their environment.
So to summarize: There isn’t any real-world Atlantis that could take back food or drink with it; whether fictional Atlanteans can consume marine resources is purely imaginative since they don’t exist.