I'm definitely not the standard on here or the person you should follow when it comes to eating the right amount of calories, protein or carbs so i'm not at ALL recommending you do what I did, it just worked for me. I did not calorie count at all or count my protein or carb in take. I got these little bowls and plates that I ate out of and that how I ate. I used yum yum dishes that helped me with my portion sizes. I still can not eat or drink alot but these portions bowls are what I used to eat out of and I was full.
http://yumyumdish.com/
My water intake I keep a bottle with me most of the time and sipped on through out the day during my first few months though it was hard for me to get enough water in me so my NP suggested that I eat ice chips or make crystal light popsicles so that's what I did.
Again by NO means am I advocating that my way is the way to do this - I just learned to listen to my body during my journey. I knew to be successful I needed to control my eating but I was never good at counting calories before but I knew I couldn't eat as much anymore so I took advance of that and just used small portion controlled dishes and I still use them. I know that I have to exercise so I got into the gym but before the gym I just walked in my neighborhood I knew at this point anything I did now would be positive and I would see the result now because of the surgery and it worked for me.