Ask five people how much water a child needs and you'll probably get five different answers — eight glasses, two litres, or simply “drink when you're thirsty.” None of those answers is completely unreasonable, but none captures the whole picture either.

A six-year-old sitting through a classroom on a cool day has very different hydration needs from the same child spending two hours at cricket practice on a hot afternoon. A single fixed number can't account for both. What helps more is a framework a parent can actually use — based on the child's age, activity, weather and the fluids already coming through their day.

And that framework starts with something easy to overlook: water isn't the only source of hydration.

Section 01 Starting point: everyday fluids

Water is the baseline, and for most of the day, it should be. But it isn't the only thing that contributes to a child's total fluid intake. Milk, diluted fresh juice, and the water naturally present in foods such as fruits, dal, curd and soups all add up quietly across the day.

A child who drinks milk, has curd with lunch and eats a water-rich fruit is getting fluid even before the water bottle enters the picture. That matters because the bottle level alone doesn't tell the whole story. A bottle coming home half full doesn't automatically mean the child was under-hydrated.

So instead of asking only “How much water did my child drink?”, the more useful question is: how much fluid did they get across the day — and what might have changed their needs?

Section 02 How age, activity and weather change hydration needs

Rather than treating hydration as one fixed number, it is more useful to think of three factors moving together.

These factors also overlap. A hot day combined with a sports match can push fluid needs higher than either factor would alone, while a cool, indoor, low-activity day may sit toward the lower end. The point isn't to calculate an exact number every morning. It's to notice which factors are in play and make fluids easier to access.

Section 03 How to tell whether the routine is working

For most parents, measuring every millilitre across a full day isn't realistic. A few everyday signals are more useful than obsessing over a single number.

• 01  Regular drinking opportunities throughout the day — at breakfast, during school, after activity and at dinner.
• 02  Normal energy through the day, allowing for ordinary tiredness such as the usual post-lunch dip.
• 03  Reasonably pale, regular urine can be one useful everyday indicator.

No single sign should be read in isolation. A child can have an off day because of poor sleep, a cold or exam stress. What matters more is the pattern across several days — and much of that pattern is shaped by what happens during the school day.

Section 04 School-day hydration

School is where hydration routines often quietly fall apart — not necessarily because anyone is neglecting them, but because access is different. A child sitting in class for six hours may not have the same easy access to fluids they have at home.

• → Make the bottle easy to use. If a child can't open it quickly without help, it may stay untouched at the bottom of the bag.
• → Attach drinking to an existing habit. Lunch or a regular break can be an easier reminder than creating a separate hydration task.
• → Keep fluids accessible where possible. Available and accessible are not always the same thing for a child in the middle of a lesson.

That works for an ordinary school day. But when the child is sweating for an extended period or spending hours outdoors in the heat, the baseline changes.

Section 05 Active days and hot days

A child sweating through an hour of outdoor sport or spending an afternoon running around outside in May heat is losing fluid — and some electrolytes along with it — faster than they would on an ordinary indoor day.

Offering fluids before, during and after activity is generally more practical than waiting until a child is visibly flushed and asking for water. The longer and hotter the activity, the more important it becomes to think beyond the ordinary school-day baseline.

Section 06 Where do electrolytes fit?

For an ordinary day — school, regular play and standard weather — plain water and normal meals are enough for most children. Electrolytes are not something a typical Tuesday requires.

The picture shifts with prolonged heat exposure, extended physical activity or noticeable fluid loss. Heavy sweating over an hour or more, for example, can mean that a drink providing sodium and potassium alongside water may be useful. A formulated option such as AYA Lemon Electrolyte is one example parents may keep for those specific situations.

The important distinction is context: electrolytes are a tool for particular situations, not a requirement for everyday drinking.

Section 07 Parent tool: a simple daily hydration checklist

Instead of obsessing over an exact volume, use a quick four-point check across the day:

• 01  Before school — a full bottle, plus milk or another fluid-rich breakfast item.
• 02  During school — refill or replace the bottle around lunch, and keep it somewhere the child can actually reach it.
• 03  After activity — offer extra fluids proactively after sport or outdoor play.
• 04  Evening — check that the day's intake wasn't concentrated into two rushed gulps before bed.

Section 08 Everyday vs. active-day hydration

The table is a practical framework, not a substitute for medical advice in situations involving illness or significant fluid loss.

Section 09 The bottom line

There isn't one correct number of glasses that applies to every child, and chasing one can create more worry than it resolves. Water and everyday fluids — milk, curd, fruit and soups — form the baseline for an ordinary day, and for most days, that baseline is enough.

What changes the picture is context: age, activity and weather can shift the need up or down. The practical job for a parent is less about running a calculation every morning and more about noticing which factors are in play today, then making fluids easy to access.

FAQ Frequently asked questions