I love water, I actually drink around the 8 glasses a day thing (even though that advice is BS lol) not cause I feel I have to, just cause its the best!
![smiley](/Fant/Image/Smiley/grinning-smiley.gif)
Despite this I was able to gain pretty easily (after overcoming my own metabolism) so, no, I do not think water does any harm to gaining.