How to make drinking water a habit that sticks

2026-10-30

To make drinking water a habit, attach one small, specific action (one glass) to a cue that already happens every day, repeat it in the same context, and track it until it runs on autopilot. Expect that to take weeks rather than days: in the best-known study on everyday habits, it took participants a median of 66 days, with a very wide range. Missing a day now and then doesn't ruin it.

Why "I'll drink more water" doesn't work

Most people already know they should drink more. Knowing isn't the problem, remembering is. In a randomized trial with kidney stone patients, people who had every medical reason to drink more, 60% said not remembering to drink was the main thing holding them back.

A habit solves that. In psychology, a habit is a behavior that's triggered automatically by a situation, without you having to decide. A review by habit researchers at University College London, Making health habitual, sums up the recipe as repeating a simple action in a consistent context until the context alone prompts it. Once that happens, the behavior needs much less motivation and memory, which is exactly what fades after the first enthusiastic week.

How long does it take?

The figure you'll see everywhere comes from a 2010 study led by Phillippa Lally. Volunteers picked a healthy behavior, such as drinking a glass of water with lunch, tied it to a daily cue and rated how automatic it felt for 12 weeks.

On average, automaticity leveled off after about 66 days.
Individual times ranged from 18 to 254 days, the upper end being an estimate projected beyond the study period.
Simple behaviors became automatic faster than demanding ones; the review above notes that drinking a glass of water became habitual sooner than doing 50 sit-ups.
Missing a single opportunity did not materially affect progress.

Lally herself warns against treating 66 days as a rule: it's an average from a small group, and the real number varies widely between people and behaviors. The useful takeaway is "about two to three months of repetition, and it gets easier along the way", not a countdown.

A five-step plan

1. Pick one tiny, specific behavior

"Drink more water" is a wish. "Drink one glass of water" is a behavior. Start with a single glass of about 8 fl oz (250 ml) and nothing else. It feels too small, and that is the point: small actions get repeated, and repetition is what builds the habit. Once it runs by itself, add a second one.

2. Anchor it to an existing routine

This is sometimes called habit stacking: "After I [something I already do], I will drink a glass of water." The UCL review uses the same "when and where" format. Good anchors happen every day, at a predictable point, in the same place:

After I switch on the kettle or coffee machine in the morning.
When I sit down at my desk.
Before I eat lunch.
After I brush my teeth in the evening.
When I get home and put my keys down.

Choose one anchor per glass. Write the sentence down; a specific plan of when and where beats a vague intention.

3. Make the action effortless

Habits form faster when there's nothing in the way. Put a glass next to the coffee machine, a filled bottle on your desk, a jug in the fridge door. If you have to go looking for a clean glass, you'll skip it on busy days. More ideas for setting up your space are in 15 easy ways to drink more water.

4. Repeat it in the same context

Consistency matters more than volume. The same glass after the same cue every day builds the link faster than drinking a lot on some days and nothing on others. The UCL review notes that varying the behavior or setting may stave off boredom but works against habit formation.

5. Track it, at least at first

The UCL review recommends a simple daily tick-sheet during the learning phase. Tracking does two things: it reminds you, and it shows progress before the habit feels automatic, which is when people usually give up. Some people like a visible streak; others find it stressful when it breaks. Either way, remember that a missed day didn't derail habit formation in Lally's study. What matters is getting back to it the next day, not a perfect record.

Reminders: training wheels, not the habit

Reminders help with the "I forgot" problem, especially in the first weeks. In the trial mentioned above, a bottle that sent drinking reminders was linked to a modest extra increase in urine volume over standard advice (1.37 vs 0.79 liters a day, with wide confidence intervals). But a notification is an external cue, and a habit is meant to be triggered by your routine. Use reminders to cover the gaps while the anchors take hold, and keep them sparse so you don't learn to swipe them away. Water reminders that actually work goes into timing and frequency.

Example: a simple water routine

Here's what a starter routine looks like for someone aiming at about 2 liters of drinks a day:

Glass with breakfast, after the coffee machine starts (250 ml).
Fill a 500 ml bottle when sitting down at work, finish it by lunch.
Glass before lunch (250 ml).
Refill the bottle after lunch, finish it by the time you leave (500 ml).
Glass with dinner (250 ml).

That's 1.75 liters from five anchors, before counting tea, coffee or the water in food. Start with steps 1 and 3 only; add the others one at a time.

Making progress visible with an app

A paper tally works fine. If you'd rather not carry one, Water Tracker logs a glass in one tap on your iPhone, Apple Watch or a Home Screen widget, and its weekly and monthly charts show your average and your streak. Reminders are optional and stop for the day once you hit your goal, so they fade into the background as the habit takes over. Our guide to tracking water on iPhone covers the alternatives too.

When it isn't working

You keep forgetting: your anchor isn't consistent enough. Pick one that happens every single day at the same place, like making coffee.
It feels like a chore: make it more pleasant (cooler water, a slice of lemon, a glass you like) or smaller.
Weekends break it: weekends have different routines. Pick a separate weekend anchor, such as your first coffee.
You're never thirsty for it: that's fine. You're not trying to force huge amounts, just to replace forgetting with a routine.

If you have a condition that requires limiting fluids, agree on an amount with your doctor first.

The bottom line

Don't rely on motivation. Choose one glass, tie it to something you already do every day, keep a glass or bottle where that happens and tick it off. Give it a couple of months rather than three weeks, don't panic about missed days, and add the next glass only when the first one happens without thinking.

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.