I am not much of a water drinker either... In my past several fasts i have been going from dry to juice with a very small water-only window in between. It is said that juice more effectively re-hydrates us as well and that celery juice in particular re-hydrates us 4x more effectively than water. I believe i have read that coconut water is quite excellent for this as well.
I would say that the return of appetite upon drinking water is not the golden rule for people, but it has happened with me for sure in breaking my past 4 or more dry fasts. Perhaps for me it was the knowledge that eating had become an option, and if i knew i was intending to go much longer with water-only it would have been avoided or i would otherwise have made it through the storm one way or another before experiencing calm and being able to coast. I really did want to have water-only for at least a half day though which seems to diminish the strength of this theory, but even this was not a hardened rule i had set within myself. So my desire to eat became staggering but to be clear it was not genuine hunger.
Until breaking the dry fast though, after the first 2.5 days i had not a thought for food, only water! The first 2.5 days i fought intermittent appetite and the last 2.5 days i fought varying degrees of thirst, so i was never quite at a place where i was experiencing ease and comfort. I felt fairly good and strong the entire time though which is an encouraging sign that things are continuing to get better and better.