In my experience, drinking water is NOT a solution to hunger feelings. If I'm feeling hungry and I drink water, I'll actually feel worse and hungrier, and more miserable overall.
What I've been told (by a medical professional) is to drink water between meals, not at meals, in order to stay hydrated, which will help keep feelings of hunger away. But once you feel hungry, you're not going to get rid of it by drinking water. Your body just isn't that stupid I guess.
The reason staying hydrated helps is because hunger and thirst signals are pretty much the same, and are easily confused. I've heard this before and disagreed with it, but had to begrudgingly concede that keeping hydrated does mean I feel less hungry in the long run. *sigh*
Edit: Tea does seem to have a hunger-curbing effect, though. You could try having some green tea when you're hungry. Mind you, this isn't going to work if your mental/craving processes are going.