I'm right there with you. I love nothing more than an tall glass of ice water, but I can't keep it down at all with this pregnancy.
I can usually keep down fruit punch gatorade and those capri sun things, so I drink those. I'm also drinking hot cocoa using water to mix it, that stays down. Occassionally I'll drink hot tea. And I can drink sodas okay, even though they aren't good for me.
I'm thirsty, so I know i'm dehydrated, but I just can't keep the water down. I plan on talking to my OB about it Tuesday.