Hydration rarely takes centre stage in conversations about well-being, even though it is the foundation on which everything else rests. Keeping your body well hydrated is not just about avoiding thirst. It is about preserving your energy, mental clarity and physical balance throughout the day. That is why hydration deserves a central place in any well-being routine, even before diet or exercise.
This guide brings together the essentials: how much you should drink each day and how to recognise the signs that your body needs more water. It also explains why the quality of the water you drink is part of the equation.
How much water to drink per day, in practice
There is no universal number that applies to everyone. The ideal amount varies with body weight, level of physical activity, climate and even diet. After all, fruit and vegetables also contribute to hydration.
Even so, there are official references. The Portuguese National Health Service (SNS) recommends drinking around 1.5 to 2 litres of water a day, depending on the person and the situation. The European Food Safety Authority sets the reference intake at 2 litres a day for women and 2.5 litres for men. This figure includes all the water from both drinks and food. It tends to increase on hot days or during greater physical effort.
More important than memorising a number is getting into the habit of drinking water throughout the day, in small amounts. Avoid trying to make up for it all at once in the late afternoon. Your body absorbs water better when it comes in regular doses. This also prevents the bloated feeling that comes from drinking large volumes in a short time.
What affects how much water each person needs
- Body weight and physical composition
- Level of physical activity and sweating
- Climate and temperature, since hot days increase your needs
- Diet, as diets rich in fruit and vegetables provide part of your daily hydration
- Consumption of coffee, tea and other caffeinated drinks, which have a mild diuretic effect
For this reason, rather than following a fixed rule, it is more useful to pay attention to the signals your own body sends. We cover this topic next.
Signs of dehydration that go unnoticed
Thirst is usually seen as the main sign that your body needs water, but it is actually a late signal. Mild dehydration often affects the body before thirst appears. Unexplained tiredness, headaches, difficulty concentrating and irritability may be linked to a lack of water. They are not always down to lack of sleep or stress, as people often assume.
Other less obvious signs include drier skin than usual, chapped lips and darker urine. On their own, none of these signs is a cause for concern. Taken together, however, they deserve attention, especially on hotter days or during greater physical effort.
Filtered water and tap water: what changes in practice
Beyond the amount you drink, there is a question that comes up more and more often: does the quality of your water make a difference? The answer is yes. This is not so much about how much water you drink, but about the experience and confidence that come with drinking it.
In Portugal, tap water undergoes rigorous treatment processes. According to the Portuguese Water and Waste Services Regulation Authority (ERSAR), the national safe water indicator has remained above 98%. This confirms the high quality of the water supplied to the tap. Even so, this water may retain tastes and odours from the chlorine used for disinfection. Its hardness, that is, its mineral concentration, can also vary from region to region.
This is precisely where home filtration comes in. It reduces unwanted tastes and odours and retains particles present in the water, making it more pleasant to drink. In practice, this supports the hydration habit itself, since better-tasting water tends to be drunk more regularly.
Hydration and energy: why water affects tiredness and focus
A substantial part of the human body is made up of water, including the brain. For this reason, the Portuguese Directorate-General of Health (DGS) warns that insufficient water intake impairs several functions. These include body temperature regulation, normal organ function and physical and cognitive performance. People often blame a mid-afternoon energy slump on lack of sleep or overwork. Yet the cause is often simply not drinking enough water during the day.
Staying consistently hydrated, and not only when you feel thirsty, is one of the simplest ways to maintain steadier energy levels. You will not need to rely on coffee or sugar to get through the day.
Water, skin and hair: how water quality affects your looks
Hydration also shows on the outside. Skin and hair are among the first visible signs of a change in your internal balance. Duller or drier skin and more brittle hair are common examples when hydration, both internal and external, is neglected.
Water quality is relevant here too. Cosmetology often associates water hardness, that is, mineral concentration, with how skin and hair react day to day, particularly in the shower or bath. It is a factor discussed less often than diet or cosmetics, but it is part of the bigger picture of body care.
How to get into the habit of drinking more water, effortlessly
Once you understand the why and the how much, the challenge is keeping up the habit. A few simple strategies usually prove effective:
- Always keep a bottle of water in sight, whether at work, by the sofa or on your bedside table
- Link drinking water to existing routines, such as waking up, mealtimes or short breaks
- Invest in the quality of your water at home, so that drinking water is a pleasant experience rather than a chore
- Turn to natural infusions with fruit or herbs on days when plain water is less appealing
Small adjustments, kept up consistently, have more impact than big one-off changes. This is, ultimately, the basis of any lasting well-being habit.
Frequently asked questions about hydration
Is drinking a lot of water at once harmful?
It is not ideal. Your body makes better use of water when it is spread throughout the day, rather than taken in large amounts all at once.
Do tea and coffee count towards daily hydration?
They count partially, although they have a mild diuretic effect. For this reason, they should not completely replace your water intake.
Do you need to drink water even when you are not thirsty?
Yes. Since thirst is a late signal, waiting for it may mean your body is already slightly dehydrated. Getting into the habit of drinking water at set times helps you anticipate that need.
Does water quality really make a difference, or is it just a matter of taste?
Taste and experience are a valid reason in themselves. Water that is more pleasant to drink tends to be drunk more often, which reinforces the everyday hydration habit.
In short
Hydration is not about reaching a perfect number of glasses a day. What matters is building a more mindful relationship with water: how much you drink, when you drink and what water you drink. It is one of the simplest pillars of well-being, and also one of those with the most immediate return: more energy, more focus and healthier-looking skin and hair.
Content developed by the Filtrarte well-being team.
This article is for information purposes only and does not replace the care of a health professional. If you have persistent symptoms associated with dehydration, we recommend seeking medical advice.
