You could also buy carbonated flavored water. I drink it. Stores have TONS of flavors and their are no calories. Works for me. I am also drinking water with lemon juice. No calories! I just got lime juice tonight and tried it. Tastes just about the same, but good for a change. Good luck!
I think of it as poison. I quit soda once I learned about the ingredients. I think educating yourself about the health risks associated with drinking it will help curb the addiction. Personally, I will not drink it now unless it's a healthy version made with natural ingredients and real sugar and then I only have it as a dessert/treat.
If you care about your body, mind and your future self you should take quitting seriously.
Google - High Fructose Corn Syrup and Brominated Vegetable Oil.
If you have other habits to break a quick and educational read is Michael Pollan's Food Rules - An Eaters Manual or one of his other books.