Originally Posted by Sly

The extra water would probably make the beer seem like an even weaker beer to the body because the dehydration elements of the beer are being diluted more. The extra water will probably also make you pee even more, which gets even more of the toxins out of your system.

You're diluting the effects of beer. You would be told to do the same thing if you induced certain types of chemicals as well. I really don't know what you are having trouble understanding.