I'm with you 100%... for about 8 years I drank NOTHING but Mt. Dew, Dr. Pepper and Mr. Pibb.. no juices, no waters, absolutely nothing else.
Then when I hit a certain age, it seemed to all catch up to me, so I gradually cut myself off. I started drinking Diet, then went for juices, then water with Crystal Light, now simply water. If water is too boring for you, the many flavors of Crystal Light will be perfect for you. The Wild Strawberry and Citrus are amazing. Even better than that, only 5 calories per pack!
Also, something that helped me, was all the cavities the soda gave me... if that isn't enough of a reason to make one stop, I don't know what is