Do you think it is the caffeine? Or is it the carbonation? I have one shelf in my fridge solely dedicated to bottles of water, I keep it chock full. No I'm not a tree hugger and I don't care about plastic bottles. But with my water set up this way, I am more inclined to drink it more.
Perhaps you could start weaning yourself off. Buy it by the 12 oz cans. But DO NOT stock it in your fridge. Put 1 in at a time. When you pull the cold one, replace it with a warm one.
Sometime back, I had found myself actually opening my 4th soft drink everyday. I was getting really bad off. I can quit, but I like it. Some days I have none, some I have 2. Having a Fresca right now
