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Eight glasses is a slogan, not a number. What you need depends on your weight, how much you move, and — in India especially — how hot it is where you are. Four questions, no email, answer on this page.
Almost everything you drink counts, and about a fifth of your fluid arrives through food. An Indian plate is unusually good at this — dal, sambar, rasam, curd and fruit all carry water.
The simplest check costs nothing and needs no app: urine colour. Pale straw is where you want to be. Dark yellow means drink more. Completely colourless, all day, usually means you are drinking more than you need.
The other signals are easy to misread as something else — an afternoon headache, tiredness that coffee does not fix, constipation, and dry mouth. In Indian summers these show up long before you feel what you would call thirsty, because thirst is a late signal rather than an early one.
By the time you feel properly thirsty you are already mildly dehydrated. This matters most for older adults, whose thirst signal weakens with age, and for anyone working outdoors.
Drinking a litre in one go does not store for later — most of it leaves within the hour. Spreading it through the day is the entire trick, which is why the schedule above splits it.
You lose sodium and potassium as well. After heavy sweating, plain water alone can leave you feeling flat; this is what chaas, nimbu pani with salt and coconut water are for.
Very large volumes in a short time dilute blood sodium, which is genuinely dangerous. If you have a kidney or heart condition, your doctor's number beats this calculator.
Honestly: KABO is not a hydration product, and it would be silly to pretend otherwise. What it does do is start the day with 250 ml of water you were going to have to drink anyway, and it carries sea salt and potassium from coconut and banana — the electrolytes that plain water does not replace.
If you use the shake, count it towards your total. If you are working out in Indian heat, the salt in it is doing more than seasoning.
As a planning figure, about 33 ml per kilogram of body weight — roughly 2 litres for a 60 kg adult and 2.5 litres for an 75 kg adult. Indian summers, humidity and physical work push it higher; a desk job in an air-conditioned office pushes it lower. Thirst and urine colour are better day-to-day guides than any formula.
Yes. The old idea that caffeine dehydrates you does not hold up at normal intakes — the fluid in two or three cups a day contributes more than the mild diuretic effect takes away. What chai does do is interfere with iron absorption if you drink it with meals, so keep it about an hour away from food.
They count, and in hot weather they do a bit more than plain water because they carry sodium and potassium — the electrolytes you lose in sweat. Chaas, coconut water and lightly salted nimbu pani are all sensible additions. Sweetened bottled drinks are a different matter.
Urine colour is the simplest check available: pale straw means you are fine, dark yellow means drink more, completely clear usually means you are drinking more than you need. Headaches, tiredness in the afternoon and constipation are common signs of running short.
Yes, though it is uncommon. Drinking far more than you need over a short period dilutes blood sodium, which is genuinely dangerous. Spread intake through the day rather than forcing large volumes at once, and if you have a kidney or heart condition, follow your doctor's guidance rather than a calculator.
It does — roughly a fifth of most people's fluid comes from food, and an Indian plate is well suited to it. Dal, sambar, rasam, curd, and fruit like watermelon and cucumber all contribute meaningfully.
These are planning estimates based on body weight, activity and climate — not clinical targets. Fluid needs change with medication, illness, pregnancy and kidney or heart conditions. If any of those apply to you, use your doctor's guidance instead of this page.