The classic advice on water is 64 oz a day, but that's been debunked recently as never having been tested in any scientific way. However, a lot of people swear by it, so I figure it can't hurt!
As for a starting point, it sounds like your problem is snacking instead of meals. If you are like me, you're kind of grazing through the day? A good starting point for me was to delineate things. I declared I was going to have three meals and three snacks a day. I sat down to eat them so it was very clear that a snack was what I brought to the table and anything eaten standing up or outside that place where I sat to eat was grazing and no longer a behavior I wanted in my life.
Give that a few days and, then, for more of a challenge, try planning all three meals and the three snacks the night before.
My main guidebook for dieting (and these two techniques and more are in there) is The Beck Diet Solution by Judith Beck. If you read that book and like it, we have an active support group on 3FC -- check us out in the Diets section.

