Mineral Water Guide
How much water should you drink per day?
The "8 glasses a day" rule is a myth. Your actual needs depend on who you are, where you live, and what you do.
The idea that everyone needs exactly 2 liters of water per day is one of the most persistent myths in nutrition. It's not wrong as a rough starting point - but it's also not a universal truth. A sedentary person living in a cool northern climate has very different hydration needs from someone who exercises daily in a hot, humid city.
What the evidence actually shows is a range, not a fixed number - and that range shifts considerably depending on several factors that are specific to you.
What the guidelines say
The most widely referenced figures come from the European Food Safety Authority (EFSA), which sets adequate intake at 2.0 liters per day for adult women and 2.5 liters per day for adult men - including all fluids from food and drink, not just water.
The World Health Organization and national health bodies in most European countries reference similar figures. These are population-level averages designed to cover the needs of most healthy adults under typical conditions. They are not prescriptions.
One important detail: these figures include water from all sources - food, coffee, tea, soups - not just what you drink from a glass or bottle. Fruits, vegetables and other water-rich foods can contribute 20-30% of daily fluid intake for many people.
Factors that increase your needs
Several circumstances push your hydration needs significantly above the baseline:
Exercise intensity and duration
Physical activity increases fluid loss through sweat. A moderate 45-minute gym session can add 500-700 ml to your daily needs. An hour of intense running or cycling in warm conditions can add 1 liter or more. The harder and longer you train, the more you need to compensate.
Heat and humidity
Hot weather dramatically increases sweat rate even at rest. Living or working in a hot, humid environment - or spending time outdoors in summer - means your body is continuously losing fluid that needs replacing. Air conditioning reduces but does not eliminate this effect.
Higher body weight
Body water volume scales with body size. A larger person generally needs more fluid to maintain the same level of hydration as a smaller one. Some guidelines suggest approximately 35 ml per kilogram of body weight as a baseline.
Low water content in diet
A diet low in fruits and vegetables provides much less water from food than a Mediterranean-style diet rich in salads, soups and fresh produce. If your meals are mostly dry or processed foods, you need to compensate by drinking more.
Illness with fluid loss
Fever, vomiting, diarrhea and high sweating during illness all accelerate fluid loss. Staying well hydrated during illness is important and often requires consciously increasing intake beyond normal.
Pregnancy and breastfeeding
Both states significantly increase fluid requirements. EFSA recommends an additional 300 ml/day during pregnancy and an additional 600 ml/day during breastfeeding above the standard adult female reference.
Factors that decrease your needs
Not everyone needs to reach the upper end of the recommended range:
Sedentary lifestyle
If your day involves little physical movement - a desk job, limited exercise, mostly indoor activity - your baseline needs are lower than average. The standard reference figures already assume moderate activity.
Cool climate
People living in northern Europe or at altitude in cooler conditions lose much less fluid through sweat than those in hot climates. Seasonal variation matters too - your winter needs are genuinely lower than your summer needs.
Diet rich in water-containing foods
A diet with high fruit and vegetable intake, soups and other high-moisture foods can contribute 600-800 ml of fluid per day from food alone. This reduces the volume you need to drink directly.
Signs you are drinking enough - and not enough
The most reliable indicator of hydration is urine color. Pale yellow is the target. Dark yellow or amber consistently through the day suggests you need to drink more.
Signs of good hydration
- ✓Urine is pale yellow during most of the day
- ✓You rarely feel thirsty
- ✓Energy levels are stable throughout the day
- ✓Skin feels normal and lips are not dry
Signs you may not be drinking enough
- ✗Urine is consistently dark yellow or amber
- ✗You feel thirsty often - thirst is a late signal, not an early one
- ✗Mild headaches or difficulty concentrating in the afternoon
- ✗Fatigue or low energy not explained by sleep or other factors
Does mineral water count the same as tap water?
Yes - from a pure hydration standpoint, mineral water, tap water, filtered water and sparkling water all contribute equally to your fluid intake. Water is water in terms of hydration.
Where mineral water differs is in its mineral content - sodium, calcium, magnesium, bicarbonate - which varies enormously between sources. These minerals do not affect how well water hydrates you, but they do affect what your water contributes nutritionally beyond hydration. If you drink 1.5-2 liters of mineral water per day, the choice of water can meaningfully affect your daily calcium and magnesium intake - which is exactly what h2oMatch helps you understand. Hydration is the baseline. Mineral profile is the next layer.
Find water that fits your daily intake
Use the Water Calculator to see how different mineral waters contribute to your nutritional needs based on your daily consumption.
Open the Water Calculator →Key Takeaway
There is no single right answer to how much water you should drink. For most healthy adults in temperate climates with moderate activity, 1.5 to 2.5 liters per day covers the range - with the higher end more relevant for those who exercise, live in warm climates or eat a dry diet. The most practical approach: drink consistently throughout the day, check your urine color, and increase intake when you exercise, when it's hot, or when you feel consistently thirsty. Once you have the quantity right, the choice of which water to drink is the next step.
FAQ
Is 8 glasses of water a day really necessary?
The "8 glasses" rule has no firm scientific basis - it likely originated as a simplification of early dietary guidelines from the 1940s. Current evidence-based recommendations from EFSA suggest 2.0 L for women and 2.5 L for men including all fluid sources, but individual needs vary considerably. Eight standard glasses (200 ml each) equals 1.6 liters - a reasonable minimum for many people, but not a universal target.
Does coffee or tea count toward daily water intake?
Yes. Despite the common belief that caffeine dehydrates you, research shows that moderate coffee and tea consumption contributes net positive fluid intake. The mild diuretic effect of caffeine does not outweigh the fluid you consume. Alcoholic drinks, however, do have a genuine dehydrating effect and should not be counted toward your fluid intake.
Should I drink more water if I exercise?
Yes, and the increase depends on the intensity, duration and conditions. As a rough guide, aim to drink 400-600 ml in the two hours before exercise and replace sweat lost during and after. Weighing yourself before and after a long session is one way to estimate sweat loss - each 0.5 kg lost corresponds to approximately 500 ml of fluid.