You just have to replace the soda with something you will drink.
A lot of people say, “just drink water.” Yeah, right, well, unless you really like water, that dog ain’t gonna hunt.
For me, I had two drinks of choice, #1 sweet tea, and #2 Mountain Dew.
I replaced them with my own homemade spearmint tea sweetened with just a bit of stevia. That worked pretty well for quite a long time.
I’ve kinda gotten away from that now and moved towards a water jug that we keep in the refrigerator that gets a couple of cut up lemons in it every few days. No sweetener or anything else, just the cut up lemons and water. We keep refilling with water when we drink out of it and find that it’s good for a few days before it needs new lemons. I don’t know how good the lemons are for us but I do know that we’ll drink that water before we’ll reach for just plain water almost every time.
Find whatever works for you. Just replace something bad with something good. The universe abhors a vacuum, unless of course, you have a really dirty house… (sorry… the mind wanders sometimes…) LOL!
Good luck!