How can I track my hydration levels throughout the day?

In the Fluid Tracker, look for glasses below the search field. You can log each glass of water or other beverages you consume by tapping '+' or '-' next to it and saving your check-in. You can also set reminders throughout the day to prompt you to drink water. To track another fluid, add it from the search field where you may select one from the dropdown or add your own custom fluid.