Water Drinking Schedule: When to Drink Through the Day

How the Schedule Works

The schedule puts your first drink at the moment you wake up and your last one an hour before bed. The rest sit evenly between them, rounded to the nearest five minutes.

It counts drinks by your glass size and rounds up, so the schedule always reaches your goal. A 2,350 ml goal in 250 ml glasses gives 10 drinks, not 9.

Sample Schedules

Here is how the same rules play out for four very different days.

Night shifts work the same way. Enter the time you wake and the time you sleep, even if that is mid-morning.

Why Spread Your Water Out

Your body handles water best in steady amounts. Healthy kidneys clear about 0.7 to 1.0 litres an hour at most, the US National Academies report.

A glass every hour or two stays far below that, while a whole bottle gulped in the evening after a dry afternoon does not.

For hot, hard work, NIOSH sets a ceiling of 6 cups (about 1.4 L) in any hour. The tool warns you if a short day would push your glasses past that pace.

Adjusting for Workouts and Heat

On training days, add a drink before you start and one after you finish. On a hot day outdoors, NIOSH suggests about 1 cup (8 oz) every 15 to 20 minutes while you work.

Fixed Times or Reminders That Adapt?

A fixed schedule suits a steady day. Real days slip. A meeting runs long, you drink two glasses at lunch, and the plan no longer fits.

The Glubbo app offers three reminder styles for that. Strict reminds you at your set interval until you reach your goal, Gentle waits twice as long and never nudges, and Smart moves the next reminder by your last drink and your pace.

All three stop once you reach your goal for the day. The US National Academies note that most healthy people meet their needs by letting thirst be their guide, so a schedule matters most on busy days when thirst gets ignored.

Common Questions

Should I drink water right before bed?

A small glass is fine. The schedule puts your last drink an hour before bed; if you often wake at night to pee, a Cleveland Clinic urologist advises you to "limit your intake of fluids two hours before bedtime" (Cleveland Clinic). Set your bedtime an hour later in the tool to get that gap.

Our guide on drinking water before bed covers night-time thirst and waking up to pee in more detail.

Should I follow the schedule exactly?

No. Use it as a frame and drink more when you feel thirsty, sweat or sit in the heat. "Drinking water on hot days can help keep you hydrated, regardless of how active you are," the CDC notes.

How do I use the schedule with exercise?

Keep your usual times and add drinks around the workout. During longer sessions, sipping about 200 ml (7 oz) every 15 to 20 minutes "may be ideal," according to the NATA position statement.

Afterwards, replace what you lost. Our guide to the best time to drink water shows how to work that out from your weight before and after.

What if I miss a drink?

Have the next one on time and add a few sips. Trying to catch up with a big glass at once brings little benefit.

Where does my goal come from?

Use the water intake calculator first. This page fills in the goal from it automatically in the same browser.