I have found in the past that the more water I drink the more water I want to drink. Then, of course, there are plenty of trips to the bathroom both night and day.
In the lead up to being diagnosed with diabetes and also when my diabetes got out of control I was drinking far too much. Once, at work, someone I worked with pointed out to me that I had drunk five litre bottles of water in a seven hour shift, plus big mugs of tea - and lots of orange or pineapple juice. Quite scary.