I've lost pretty good so far.. but I think maybe it has to do with what size you are to begin with?? I mean, I'm sure that's not the total reason, but in my own "uneducated" opinion as far as fat loss on a body, I think that if someone.. myself ok.. 5'0 frame weighing 210 lbs like I did when I started.. Lord knows I didn't need all that weight on me. So, I think since I wasn't feeding my body 3000-4000 calories a day like my big butt was before changing my ways.. I didn't need all that fat. So it starts to leave.. to me anyhow that makes sense. For my frame that's a lot of fat ya know.. I know my diet and exercise are a big part of it too.. but the rapid part.. I think is because of that... ??
Example: Breakfast.. either a packet of oatmeal.. the instant kind, I stick to cinnamon apple because I LOVE it.. and it tastes yummy and it's quick.. and a piece of fruit.. OR 2 eggs a slice and a slice of toast.
Snack: Granola Bar or Special K 90 calorie bar or fruit
Lunch: salad with boneless skinless chicken breasts or a healthy choice or lean cuisine meal or a low carb tortilla with some lunchmeat and a salad or fruit.
Dinner: Fish and veggies, chicken and veggies.. a salad..
I eat whatever I want to it, I don't restrict myself from anything.. if I want something that's not healthy per say.. like speghetti.. I have a palm size portion of it. I used to say I could never just eat a palm size portion of what I really really like... BUT.. I realize now that if I want a nice healthy good looking body and if I don't want to shop in the fat stores anymore.. and if I want to actually buy AND wear something that's so cute.. I HAVE to control myself and be grateful that I'm not on some diet that makes it where the only way I could have even a portion of speghetti is by having cheated.. and I make sure that it's important enough to me to stop at that. I could never do that til now. I say it a lot so sorry to repeat myself.. but I fight me.. I make sure the inner part of me that really wants a better me.. wins over the bad inside me that wants a HUGE helping.
I hope this helps. You only said a sentence about the water and exercise so I know it's not right to just assume I know what you meant, so, I'm just going to say .. that for a very long time, like um, my entire life, I always said "oh I want to lose weight.. " then people would tell me how key drinking lots of water and exercise was.. so then I'd say "I really want to lose weight.. yes, yes, I know.. drink water and exercise".. but now I realize how true that is. Drinking lots of water not only helps your body function better.. which helps your metabolism work better.. but it's also an appetite suppresant so you don't eat so much.. as long as your taking in that water. Exercise is .. that old saying move it and lose it.. It's funny to me.. but I really believe the key to weight loss and staying thin is simple.. heard it a lot in my 28 years.. but eat what you want in small portions, don't over do it.. make wise choices most of the time.. don't eat brownies all day long in small portions ya know.. exercise and drink water.. I'm doing that and I am losing.. I'm down almost 30 lbs since 8/10. Have a long way to go.. but I'm working on it!
Hope this helps you somewhat atleast!!!