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Watimer - Hydration Reminder

Watimer is a small, no-fuss water intake log. Each time you drink, tap Record and choose a cup (250 ml), a bottle (500 ml) or type any amount in milliliters. A progress bar at the top shows how much you have had today against a daily goal you set in liters.

It is meant for people who simply forget to drink during a busy day: office workers who look up at 4 pm and realize the bottle on the desk is still full, students in long study sessions, or anyone trying to build a steadier habit. Seeing the number climb is often enough of a nudge to reach for another glass.

There is nothing to sign up for. The log lives in your browser, starts fresh each new day, and keeps only what you need: today's total, the goal, and a list of what you drank and when.

Open full screen

The app runs entirely in your browser. What you enter is saved only on this device.

How to use Watimer

  1. Set your daily goal. Tap the gear icon in the top bar and enter a daily goal in liters, for example 2.0 or 1.5. The change is saved as you type, so just tap Close when you are done.
  2. Log a drink. Tap the Record button in the bottom-right corner. Pick Cup (250ml) or Bottle (500ml) to add that amount straight away.
  3. Enter a custom amount. Choose Other in the same dialog, type the amount in milliliters (for example 350 for a can or a large mug) and tap Add.
  4. Watch today's progress. The Today's progress card shows a bar and a figure such as 1.25L / 2.0L. When the total reaches the goal, a short congratulations message appears.
  5. Review the history. Below the card, today's entries are listed newest first with the time and the share of your goal each one covered, so you can see whether you drank steadily or all at once.
  6. Fix a mistake. Swipe an entry to the left and confirm to delete it. Today's total goes down by that amount.

Features

How much water do you need, and how to make drinking a habit

There is no single right number

The familiar advice of "eight glasses a day" is a handy rule of thumb rather than a scientific requirement. Total fluid needs depend on body size, activity, climate, diet and health. Public health bodies such as the European Food Safety Authority have suggested adequate total water intakes of roughly 2.0 liters a day for adult women and 2.5 liters for adult men, but that figure includes the water in food, which typically provides around a fifth of the total.

So a goal of 1.5 to 2 liters of drinks is a reasonable starting point for many adults, and it is fine to adjust it. Raise it on hot days, during exercise or when you sweat a lot; people who are smaller or less active may need less. If a doctor has given you a fluid limit, use that number instead.

Signs worth paying attention to

Thirst is the body's own reminder, but it can be easy to ignore when you are concentrating. Pale straw-colored urine generally suggests you are drinking enough, while dark yellow urine, headaches, tiredness or poor concentration late in the day can be hints that you have fallen behind. Older adults often feel less thirsty, which makes a simple log more useful.

More is not always better. Drinking very large amounts in a short time, especially during long endurance events, can dilute the body's sodium. Spreading drinks through the day is both safer and easier on the stomach.

What counts toward your total

Water is the simplest choice, but milk, tea, coffee, sparkling water and soups also contribute fluid. Moderate amounts of tea and coffee still hydrate overall, even though caffeine has a mild diuretic effect. Sugary drinks and alcohol are better kept as extras rather than the main source. Log whatever you count toward your own goal and stay consistent.

Turning it into a habit

Habits stick when they are tied to things you already do. Try a glass when you wake up, one with each meal, and one whenever you sit down to start a new task. Keeping a bottle of known size in view helps too: if you know it holds 500 ml, logging it is a single tap and you can quickly tell how many refills you still need.

Check the history list in the afternoon. If most entries are clustered in the morning, plan a couple of drinks for the rest of the day rather than catching up with a large amount in the evening, which can also disturb sleep.

Frequently asked questions

Where is my data stored?

Only in this browser on this device, using its local storage. There is no account and nothing is uploaded. If you clear your browser data or use a private window, the log and goal are removed, and they do not sync to other devices.

Does the web version send drink reminders?

No. A web page cannot reliably send scheduled reminders once it is closed, so the reminder times and interval settings are not shown here. The iPhone and Android apps can send notifications at an interval you choose between a start and end time.

What else differs from the phone app?

Apart from reminders, the logging, daily goal, progress bar and history work the same way. The phone app also offers an optional upgrade that removes ads; the web version does not show in-app ads or offer purchases.

When does the count reset?

When you open Watimer on a new calendar day, today's total and history start again from zero. Earlier days are not kept as a long-term history.

Can I log drinks in ounces?

Amounts are entered in milliliters and the goal in liters. As a guide, 8 US fluid ounces is about 237 ml and a 16.9 oz bottle is 500 ml.

I logged the wrong amount. How do I fix it?

Swipe that entry to the left in the list and confirm the deletion, then log the correct amount.

Limitations of the web version

Disclaimer

Watimer is a general wellness log, not medical advice. Fluid needs vary from person to person. If you have a heart or kidney condition, are pregnant, or have been told to limit or increase fluids, follow your doctor's advice.

Phone app

Watimer is also available as an app for phones and tablets:

App Store (iPhone, iPad) Google Play (Android)

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