I've been to the Atlantis 6 times, and I've never drank the tap water. I can't tell you if it's ok to drink or not, but I personally do not take a chance with it. Who wants to get sick on vacation? Word of advice - buy your bottled water at the shopping mall across the street from the Coral Towers entrance. It's a short walk - worth your while. Several of the stores there sell water and it's MUCH cheaper than buying it at the Atlantis !!!
I've stayed at CS 4 times and am going again in 3 1/2 weeks. I only use the water when I brush my teeth, and do't swallow much of it. We bring our own bottled water.
its better to be safe and drink bottled water..Have fun!!