I'm addicted to soda and I don't know how to stop.
Why do you think you're addicted to soda specifically?
I drink it because it's so easily accessible to me and I can't break the habit.
Soda is really cheap and tastes great so it's understandable that you have a hard time cutting it from your diet. You could try a less harmful alternative to ease any withdrawal like symptoms you feel like water enhancer. That should help you cut it easier.
I want to break the habit, but it's so easy to drink.
The sugar and soda in caffeine are pretty addictive, but it's very unhealthy to drink so much sugar. There are lots of bubbly waters out there with that might substitute for you. Or you could slowly cut down a little week by week.