How much water should you drink a day? A personal guide

How many glasses of water should we drink a day? It is one of the most common health questions there is. The "eight glasses a day" rule is easy to remember, but real needs vary from person to person, and even for the same person from season to season. In this article we bring together the factors that shape your daily water needs, a practical way to estimate them and habits that suit the hot climate of North Cyprus.

What determines how much water you need?

More than half of the human body is water, and that water is constantly being replaced throughout the day as we breathe, sweat, digest and go to the toilet. The main factors that decide how much we lose, and therefore how much we need to take in, are:

• Body weight: A larger body needs more fluid.
• Physical activity: Sport, gardening or a long day on your feet increases losses through sweat.
• Temperature and humidity: Summer days above 35 °C in Kyrenia, combined with humidity, can cause significant fluid loss without you noticing.
• Age: Children and older adults may feel thirsty later than others.
• Health: Fever, diarrhoea, some medicines, pregnancy and breastfeeding all change requirements.
• Diet: Water from vegetables, fruit and soups also counts towards your daily total.

A practical starting point: 30–35 ml per kg

A widely used general approach for healthy adults is around 30–35 ml of fluid per kilogram of body weight per day. It is not a strict rule; it is a starting point for observing yourself.

| Body weight | Approximate daily need (30–35 ml/kg) | |---|---| | 50 kg | 1.5 – 1.75 L | | 60 kg | 1.8 – 2.1 L | | 70 kg | 2.1 – 2.45 L | | 80 kg | 2.4 – 2.8 L | | 90 kg | 2.7 – 3.15 L |

On days when you exercise hard or work in the heat, adding roughly 0.4–0.8 litres for every hour of activity is a commonly accepted general guideline. To see your own figure quickly, try our water calculator.

Important: Needs are different for people with kidney, heart or blood pressure conditions, those advised to restrict fluids, and pregnant or breastfeeding women. Always ask your doctor about your individual needs.

How can you tell if you are drinking enough?

Your body gives you clues. These simple observations are often more useful than any calculator:

1. Urine colour: Pale straw yellow usually suggests adequate intake. Dark yellow may mean you need more water.
2. Thirst: By the time you feel thirsty, your body has already lost some fluid; drinking regularly before thirst sets in is better.
3. Energy and focus: Even mild dehydration can show up as tiredness, headaches and poor concentration.
4. Dry mouth and lips: Especially in air-conditioned rooms, this can be an early sign.

Turning water into a daily habit

Knowing how much to drink is half the job; the real challenge is keeping it up every day. A few small habits that work:

• Start the day with a glass of water. The body loses fluid overnight, so a glass first thing in the morning is a good start.
• Keep a bottle in sight. A bottle on your desk or in your bag is the most effective reminder there is.
• Pair water with meals. A glass with every meal covers a large part of your daily total almost automatically.
• Set time-based targets. For example, one litre by lunchtime and another by early evening.
• Cut back on sweet drinks. Sugary drinks and too much caffeine cannot replace the benefits of plain water.

How much water should a household keep?

A family of four needs roughly 8–10 litres a day for drinking and cooking. That works out at about three to four 19-litre bottles a week. So you never forget to reorder, you can set up a scheduled delivery subscription and choose your own delivery day and time slot.

Water you know the source of

What you drink matters as much as how much. Girne Su publishes the results of its regular laboratory analyses openly; you can review pH, total dissolved solids and mineral values on our water quality page.

In short: set a target based on your weight and your day, watch your body's signals and spread your water intake across the day. In the hot Cypriot summer, this simple habit is one of the easiest ways to feel more alert and comfortable.