One option is to make your own simple syrup at home and add a small amount to a sparkling water of your choice. I am personally quite happy drinking water all day but I did this to help transition hubby off of soda. I started making it just a little less sweet than soda and then cut it down slowly over time- now he drinks his lacroix without anything in it most of the time. Occasionally he'll add juice or elderflower syrup to it, but I don't make simple syrups at home. The nice part about it is that you can flavor it however you want! Ginger lime syrup in lime or lemon lacroix is delightful, for example :)
I do really enjoy metromint water- they have a chocolate mint flavor (still not fizzy, no sweetener added) and it's kind of amazing. It's also pricey so I couldn't tell you the last time I bought it but it's definitely fun.
We also do enjoy kombucha and kefir from time to time- maybe see if you like either? If you don't like the first one you try I would recommend trying another brand. I currently love Big Easy Bucha's Satsuma flavor! We like kevita's mojito flavor as well.
Not sure if you're a smoothie fan, but I do have a protein shake just about every day. Always an easy way to add more fruit and veggie to your diet, and more filling than juice since you keep the fiber.
Another favorite is lassi- it's a yogurt based drink that you most commonly find flavored with mango. I add honey and cardamom to mine and tons of ice- it's almost like soft serve that way...mmm. Haven't made lassi in a long time- maybe I'll plan for it this weekend!
Healthy choices and actions have positive impacts, even if the scale doesn't move!