I too have found La Croix is good (but then again, it is carbonated)...I can't have caffeine and also avoid the aspartame/sucralose things so finding something other than plain water has been quite the challenge.

I like the Vita Coco Passion fruit flavored coconut water, it's all natural and no artificial, kinda juice-ish, but not too high in sugar.

If you like hot drinks, some Apple juice warmed up is delish (once again, if worried about sugar, you can do 1/2 water...) If not worried about sugar, try Starbucks "caramel apple spice" so delicious...(no I am not affiliated with them in any way, but I love that dang drink!)

I hope this helps, I truly understand how hard it is to not be able to drink certain things...I would go nuts if I couldn't have carbonated stuff.

Ooh! Sobe Lifewater is good too....