Im 8 weeks and for the last 8 days i cant keep down water, solids, nothing but 5 grapes at a time and flat ginger ale that i have to sip on. This is my second pregnancy and im miserable. So i feel your pain. i honestly gave up on water about 4 days ago my tummy was so weak. I just have to wait 3 more weeks and hopefully the all day sickness goes away. Im on nausea meds so im not nauseated all the time but i still vomit. And let me tell you vomiting with little nausea is like a surprise for everyone. Havent gone to work in a week....
8-9 glasses is plenty. Too much water can actually be harmful over time as it dilutes your sodium levels (not good).