Survivor on Island

Is it a dream or real where the hell is this place. My name is "whoosh" oh shit it came back I don't know how much days I have so if someone able to see this inscription you don't drink that spring water and I don't have much time to explain I wish I had more time - DK this was written on the wall near the fall. I can see the water despite warning the water is kind of alluring like if I didn't drink it I would contempt to die. what should I do??