J-Mann, I refuse to switch solely to water. Sorry, but I am not going to do that and it's not going to kill me. Gauss, I do drink predominately diet, although I do enjoy an occasional regular pop from time to time. I will mix in water every now and then, but I refuse to switch exclusively to water. I don't drink a lot of coffee, although I do enjoy it on occasion.
No one's asking you to castrate yourself ... I'm asking that you consider water or something better for yourself than just pop all the time. No, pop won't kill you. Drinking nothing but pop will contribute to your weight struggle and eventual early death.
I'm urging you to try it because, from what you post, the fluids you take in are almost exclusively sodas. At least boost your fluid intake with water or Gatorade, and if you need the caffeine, coffee.