I used to take creatine - stop ! Your body creates creatine naturally - when your body senses that an outside source supplies you with enough, or even too much creatine, your body slows down or stops the production of the natural chemical. Drinking a lot of water naturally will hydrate your muscles and clean out your system. Also, creatine is harmful to the kidneys.

there is nothing wrong with using creatine.
i dont think over-drinking will affect your result, just drink a decent amount, because creatine helps to absorb more water into the muscles.