Diabetic here, so Coke Zero/Gatorade Zero was my go to for a long time, but I've swapped to tap water NOT bottled water. I just add a couple squirts of the flavored concentrate(Mio etc), helps me drink more water. Easily drink 3L of "water" a day. Taking Jardiance now too which makes you pi$$ a LOT. I'm easily up 3-4 times a night.