Written & medically reviewed by Dr. Sanjay Anbu, MBBS· Last reviewed
There is no single magic number, but most adults do well on roughly 2–3 litres of fluid a day — more in India’s heat or with exercise. The simplest guide is your body: your thirst and the colour of your urine. Here is how to judge it.
Most adults: about 2–3 litres of total fluid a day
Drink more in hot weather, with exercise, fever or diarrhoea
Pale-yellow urine usually means you are well hydrated
Dark urine, thirst and dry mouth suggest you need more
Water is best; limit sugary and very caffeinated drinks
When to see a doctor urgently
Dizziness, confusion, very little urine or a fast heartbeat (dehydration)
Inability to keep fluids down with vomiting or diarrhoea
Swelling or breathlessness if you have heart or kidney disease (you may need to limit fluids)
Some conditions change the rules. People with heart, kidney or liver disease may need to limit fluids — follow your doctor’s advice. MedDroid gives general information, not a diagnosis.
Frequently asked questions
Is 2 litres of water a day enough?
For many adults, yes, but needs vary with body size, climate and activity. In India’s heat or with exercise you may need more. Let thirst and urine colour guide you.
Can you drink too much water?
Rarely, drinking excessive water very fast can dangerously dilute the body’s salts. For most people this is not a concern, but those with heart or kidney disease should follow medical advice.
How do I know if I am dehydrated?
Common signs are thirst, dark urine, dry mouth, tiredness and dizziness. Severe dehydration with confusion or very little urine needs medical care.
Reviewed by Dr. Sanjay Anbu, MBBS. MedDroid is an AI medical assistant and can make mistakes. It provides general health information, not a diagnosis or medical advice — always consult a qualified clinician. In an emergency, contact your local emergency number immediately.