Two suggestions

Two additions is like to see would be the tracking of decaffeinated items and iCloud or Dropbox synchronization support.

Adding Decaf Coffee and Decaf Tea would be most helpful. Right now I put those items under "other". Im not sure if thats the best choice. I cant select tea because tea has a lot more caffeine than decaf coffee.

The other addition would be iCloud or Dropbox synchronization support. This way my iPads and iPhones would be in sync.

RVR57 about Water Balance: hydration and drinking tracker with goals and reminders