Hiye
I never had this problem with water but had it with milk and still do lol! My sis gave me a tip if and when my ds was sick and wouldn't drink, am not sure if this helps or not but she sugggested soaking a clean sponge in drinking/bottled water and letting him suck on that? Also my uncle is a GP and used to laugh at me (this didn't help at me panicking over ds not drinking/eating). His advice was, is he sick/tired/showing any signs of being unwell? To which the answer was no as he could see my ds running around like a lunatic, his reply was he is doing great he is getting all he needs from his food if he wasn't he would be unwell. Then he said he would look at him but until he showed any signs of being ill he said just to enjoy him and stop panicking! I also had ds at a baby dr cause I thought my uncle was a bit too relaxed about the situation, I mean he didn't have into laugh in my worried face lol!! The baby dr said the same he's in great shape if a little underweight (that was his make up) and he didn't like milk (or lumpy food) so that's that stop worrying! Give him what he likes (non lumpy food) (he drinks water) and everyones happy.
My ds vomits on demand esp if theres lumpy food involved, even nowI at almost 2 he vomits, so if I can offer you any advise its this, your lo is prob getting enough fluids from her milk, you may see her water intake improve as she cuts down on her milk or you may not. Don't worry she will get enough to do her. I spent so much time worrying that I was bordering on obsessive! I tracked every ounce (and there wasn't that many) ds took. I had to feed him whilst he was sleeping cause the min he realised he was drinking a bottle he spit it out. Every ounce was a achievement (told you I was obsessived lol) I admitted defeat when he was 10 months old and gave up the fight and if there is one thing I learned its you can't force a baby to do something he doesn't want to do.
Sorry for rambling but I'm trying to save you some heartache (lthough I didn't believe 2 qualified doctors lol and my uncle has 3 sons and one was a vomitor,its a family trait!) Hope this helps, best of luck and enjoy your lo, God knows we waited long enough to get them