How to drink enough water at work

2026-10-30

To drink enough water at work, make it part of the workday's structure rather than something you remember: a filled bottle where you work, a glass at fixed points (arrival, each meeting or break, lunch, before you leave) and a refill rule. Aim to drink steadily through the shift instead of making up for it in the evening. If you work in heat or do physical work, you need more, and on a schedule.

Why work gets in the way

Work is where most adults spend 8 or more of their waking hours, and it's where drinking tends to slip. Common reasons:

You're absorbed in a task and don't notice thirst until late afternoon.
Meetings and calls run back to back.
On shifts, breaks are short, irregular or skipped.
Some people drink less on purpose to avoid bathroom trips.
In some jobs, such as healthcare or food handling, you're not allowed to keep a drink at your workstation.

This isn't just a theory. In a UK study of 88 doctors and nurses, the HANDS study, 36% were dehydrated at the start of their shift and 45% by the end, and dehydration was associated with some impairment of cognitive function. A Japanese study of 115 hospital nurses found about half were already dehydrated before the day shift and 71% after it. Both are small, observational studies, but they show how easily a busy shift turns into a dry one. For what mild dehydration may do to concentration, see hydration, focus and memory.

How much to drink during the workday

There's no special workplace target. Most adults need roughly 2 to 2.5 liters of total water a day from drinks and food, and the NHS suggests 6 to 8 glasses of fluid a day as a flexible guide, more if you're in a hot environment or physically active for long periods. A useful rule of thumb for a standard office day: about half of your daily drinks should happen during working hours, which for most people is 3 to 4 glasses, or 0.75 to 1 liter. Water, tea and coffee all count.

At a desk

Give your bottle a fixed spot

A bottle on your desk, in your line of sight, does most of the work. A 17 fl oz (500 ml) bottle is a convenient unit: finish one by lunch and one by the end of the day and you've had a liter at work.

Use refill points, not willpower

Tie refills to things that already happen: when you arrive, when you come back from lunch, every time you go to the coffee machine. "Empty bottle means a walk to the water cooler" is also a built-in movement break.

One glass before each meeting

Meetings are predictable cues. Take a glass or your bottle in with you, or keep it next to you on video calls. A one-hour meeting is long enough to finish a glass without noticing.

Pair coffee with water

If your workday runs on coffee, put a glass of water next to each cup. Coffee counts toward your fluids, and moderate amounts don't dehydrate regular drinkers; the details are in does coffee dehydrate you?.

On shifts and in jobs where you can't drink at your station

Pre-load at the start. Drink a large glass (around 300 to 500 ml) before your shift begins, so you're not starting behind.
Drink at every break, even short ones. Keep your bottle where you take breaks: break room, locker, vehicle. Five seconds of drinking each time adds up across a 12-hour shift.
Don't save it all for the end. The HANDS data show that dehydration tends to get worse, not better, over a shift.
Check, don't guess. Pale, straw-colored urine is a good sign; dark urine after a shift means you should drink more next time. See what your urine color says for the caveats.
Night shifts: spread drinks across the shift and taper off in the last couple of hours if you need to sleep right after.

If you're cutting back on water to avoid bathroom trips, that's worth raising with your manager. Drinking less to avoid toilet breaks is a common pattern, but it's a workplace problem, not a personal failing.

Outdoors, in heat or doing physical work

This is where hydration becomes a safety issue. For moderate activity in the heat lasting under two hours, the US National Institute for Occupational Safety and Health (NIOSH) recommends drinking 1 cup (8 oz, about 240 ml) of water every 15 to 20 minutes, rather than waiting until you're thirsty. It also says fluid intake should generally not exceed 6 cups (about 1.4 liters) an hour. If you're sweating for several hours, NIOSH suggests sports drinks with balanced electrolytes, and advises avoiding alcohol and drinks high in caffeine or sugar.

Heat illness can come on quickly. Our guide to staying hydrated in hot weather covers the warning signs and when to stop work and get help.

Commuting and working on the move

Keep a bottle in your bag or car door and refill it before you leave the office or site.
On long drives, plan drinks at rest stops rather than skipping them to save time.
Drivers and field workers can log a drink quickly from the wrist or by voice, which is easier than typing at a red light (don't).

Making it automatic

The setups above work best when each glass is tied to a fixed moment in the workday. A simple office version:

Fill your bottle when you arrive and drink a glass with your first coffee.
Drink before each meeting.
Refill at lunch and have a glass with your meal.
Finish the bottle before you leave.

If you want something to keep count, Water Tracker logs a glass in one tap from your iPhone, Apple Watch or a Home Screen widget, or with "Hey Siri, log water in Water Tracker". You can set reminders to match your working hours, say 9:00 to 17:00 every 2 hours, and they stop for the day once you've reached your goal. The Apple Watch app works even if your iPhone is in a locker.

If you have a health condition that affects fluid balance, or your doctor has given you a fluid limit, follow that advice over general guidance.

The bottom line

At work, drinking slips not because people don't care but because the day is full. Give your water a fixed place and fixed moments: a bottle in sight, a glass at arrival, at every meeting or break, and at lunch, with a refill rule. On shifts, drink at the start and at every break. In heat, drink on a schedule of about a cup every 15 to 20 minutes, without exceeding about 1.4 liters an hour.

This article is general information, not medical advice. If you have a health condition, are pregnant or take medication, ask your doctor how much you should drink.