Like several reviewers, I also have kidney stones and use this app to keep hydrated and track/log my intake. Its a good resource and motivator but some of the log features could be better such as keep recent day on top instead of scrolling. 16.9 oz of water should be 16.9, not 17oz of water! (Biggest complaint so far) Would like to select or specify juice or water type (vitamin water) not just generic. Over all a good app.