You know you have heard this elsewhere, but I also drink a lot of water.
I try for 8 - 17 oz bottles per day. I have to get up in the middle of the night once or twice, but I really think it helps. I stagnated a little with losing weight, and I looked into what I wasn't doing. I stopped keeping track of my water intake, because I thought I had the hang of it. When I stop writing stuff down, I don't do it right.
I upped my water intake and began losing again.