Why all doctors say that if weightlifting and have protein diet shoud i dring plenty of water and how much is plenty? is it about dehydration or more?

Rhabdomyolysis: Rhabdomyolysis is a condition in which the muscles break down into a pigment that can get deposited in the kidneys and can cause kidney damage even kidney failure. That is why is it is recommended that people who do strenuous exercise regimen such as weight lifting drink enough water(say ~ 1 liter/day) to keep the kidneys perfused to prevent themselves from getting this complication.