Hydration Myths: How Much Water You Really Need

On one side: the gallon-jug crowd hauling 4 litres around like a part-time job. On the other: people who claim you just 'drink when thirsty' and never think about it. Both miss the point. Your actual water need is a moving target based on a few simple variables — and once you know them, hydration stops being a mystery.

How Much Water Do You Actually Need?

A practical baseline is 30–40 ml per kg of body weight per day. For a 70 kg person, that's 2.1–2.8 litres — including the water in food, chai, coffee, and curd (yes, they all count). Then add for training: roughly 500–750 ml per hour of exercise, more in heat.

• Body size: bigger bodies need more — the per-kg formula handles this.
• Climate: humid Indian summers can easily add a litre to your needs.
• Sweat rate: some people are salty, heavy sweaters — if your shirt shows white salt lines, that's you.
• Diet: high-protein and high-fibre diets increase water requirements slightly.

The Two-Second Self-Check

You don't need an app. Urine color is a reliable real-time gauge:

• Pale yellow: you're well hydrated. Carry on.
• Dark yellow: drink a glass or two over the next few hours.
• Crystal clear, all day: you're likely overdoing it — overhydration is real and uncomfortable.
• Headache plus dry mouth mid-afternoon: usually mild dehydration, not a caffeine deficiency.

Do You Need Electrolytes?

For sessions under 60 minutes, plain water is genuinely enough — sports drinks at that duration are mostly sugar you didn't need. Past 60–90 minutes, or if you're a salty sweater training in heat, sodium matters: a pinch of salt and a squeeze of lemon in your bottle covers what most commercial drinks do, for a fraction of the price. Cramping in long sessions is often a sodium story, not a water story.

A Simple Training-Day Hydration Plan

• Morning: 400–500 ml within an hour of waking — you wake up mildly dehydrated by default.
• 2 hours before training: 400–500 ml so you start topped up.
• During: 150–250 ml every 15–20 minutes, sipped — not chugged.
• After: drink to replace roughly 1.25× what you lost (weigh yourself before and after once, out of curiosity — the number surprises people).

Hydration is a habit, not a metric to obsess over. Keep a bottle visible on your desk, drink a glass with every meal, and check the color once a day. That's 95% of optimal — no gallon jug required.