not too sure what excessive water consumption would do. Definitely if you are not drinking enough, you need to increase... I don't know the science behind how much water intake is good but if you are sweating it up on the footy field, 4 litres a day on those training days sounds about right. You wouldn't need 4 litres if it was just school and hometime.
can i mail you pictures of my skin to see if you can advise me furthur?