Here is a hydration tracker that takes into account your age, sex, and other factors to provide personalized tips and keep you hydrated. The Pryme Vessyl Hydration Tracker can sync with Fitbit, Jawbone Up, and other activity trackers.
It uses a blue light to give you feedback on your hydration level. Pryme Vessyl has a Tritan exterior and a spill-resistant lid. Costs under $80 at this time.