Earlier quoted context omitted.
I think sparkling water is a great alternative, but I'm skeptical that all the fake sugars will turn out to be much better in the end. We seem to have a habit of replacing known bad things with things that we just haven't found out are bad yet.
Indeed the WHO advised against sweeteners just a couple weeks back: https://www.who.int/news/item/15-05-2023-who-advises-not-to-...
If you're already in the middle of the healthy BMI range and not having trouble keeping a healthy weight, I don't think there's been a demonstrated harm.