For years I just drank water whenever I felt like it. Some days that was two glasses, some days maybe six. I never thought about it much until I started getting these annoying afternoon headaches. Not painful enough to take medicine, but enough to make me zone out at my desk for an hour every day around 3 PM.
I tried everything. Sleeping more, cutting screen time, adjusting my chair. Nothing worked. Then a friend casually asked, “How much water do you drink?” I said I didn’t know. He said, “That’s probably your problem.”
He was right. I started tracking and realized I was drinking barely a litre on most days. For someone my size, that’s nowhere near enough. The headaches went away within a week of drinking more. That’s when I started paying attention to hydration — and realized most people have no idea how much water they actually need.
The “8 glasses a day” thing is made up
Everyone’s heard it. Eight glasses a day. It’s on posters in doctor’s offices, it’s in every health article ever written, your mom probably told you this growing up. But here’s the thing — nobody can actually point to the study that proved it.
Because there isn’t one. The “8 glasses” rule is one of those things that got repeated so many times that everyone assumed it was science. In reality, how much water you need depends on your body weight, how active you are, what climate you live in, and what you eat. A 55 kg person sitting in an air-conditioned office all day does not need the same amount of water as a 90 kg person who runs 5 km every morning in Lahore’s summer heat.
That’s why I built our water intake calculator. You put in your weight and activity level, and it gives you an actual number based on your body — not some generic rule from a 1940s nutrition pamphlet.
How I figured out I was dehydrated without knowing it
The headaches were the obvious symptom. But once I started paying attention, I noticed other things I’d been ignoring:
- My urine was dark yellow most of the time. I thought that was normal. It’s not. If you’re properly hydrated, it should be a light straw colour. Dark yellow means your kidneys are conserving water because there’s not enough coming in.
- I was tired by 2 PM every single day. I blamed it on lunch or bad sleep. Turns out mild dehydration tanks your energy levels. Your blood gets slightly thicker, your heart works harder to pump it, and you feel sluggish.
- My lips were constantly dry. I was buying lip balm every other week thinking it was the weather. It was partly just not drinking enough water.
- I was snacking more than I needed to. This one surprised me. Sometimes your brain confuses thirst with hunger. I’d eat a biscuit when what I actually needed was a glass of water.
None of these symptoms felt serious on their own. That’s the problem with dehydration — it’s not dramatic. You don’t collapse. You just feel a little off, every day, and you get used to it.
What actually changed when I started drinking enough
I used the calculator, got my number (about 2.7 litres for my weight and activity level), and started hitting that target daily. I bought a 1-litre bottle and made a rule: finish it three times before bed.
Within a week:
- The afternoon headaches stopped completely
- I had more energy after lunch — that 3 PM crash mostly disappeared
- My skin looked less dull (my sister pointed this out, not me)
- I stopped snacking as much between meals
I’m not saying water is a miracle cure. It’s not. But if you’ve been running on 3-4 glasses a day for years, bumping it up to what your body actually needs makes a noticeable difference. It did for me.
The coffee question everyone asks
When I told a coworker I was trying to drink more water, the first thing he said was, “Does chai count?” Then another person asked about coffee. This comes up every single time.
Short answer: yes, tea and coffee count toward your daily water intake. Caffeine has a mild diuretic effect, but the water in the cup more than makes up for it. You’re not dehydrating yourself by drinking chai. If you have 3 cups of tea a day, that’s still fluid going into your body.
That said, I wouldn’t count tea as your main water source. It’s got caffeine, it’s often got sugar, and if you’re anything like me, you drink it hot and slow — it’s not replacing proper hydration. I count my tea as a bonus, but I still aim to hit my water target with actual water.
The tricks that actually helped me drink more
Knowing the number is one thing. Actually drinking that much water every day is another. Here’s what worked for me:
- One bottle, visible at all times. I keep a 1-litre bottle on my desk. If I can see it, I drink from it. If it’s in the kitchen, I forget it exists.
- Drink a full glass first thing in the morning. Before chai, before breakfast, before checking my phone. You wake up dehydrated after 7-8 hours of no water. Starting the day with a glass puts you ahead immediately.
- Drink before meals, not during. I started having a glass of water 15-20 minutes before lunch and dinner. It helps with digestion and also means I eat slightly less because I’m not confusing thirst with hunger.
- Don’t wait until you’re thirsty. This was the biggest lesson. Thirst is a late signal — by the time you feel it, you’re already mildly dehydrated. I just sip throughout the day whether I feel thirsty or not.
I tried the phone reminder approach for a while — setting hourly alarms to drink water. It worked for about three days and then I started dismissing the notifications without thinking. The bottle-on-desk method works much better because it doesn’t require any willpower.
When a calculator isn’t enough
I want to be honest here. A water intake calculator gives you a solid baseline for a healthy person with a normal routine. But if you have kidney problems, heart issues, or you’re on medication that affects fluid balance (like diuretics), the number from any online calculator might not be right for you. Talk to your doctor in those cases. This tool is for everyday guidance, not medical advice.
Same goes for pregnancy and breastfeeding — fluid needs go up significantly, and the specific amount depends on factors that a simple calculator can’t fully account for.
Check your number
If you’re reading this and you have no idea how much water you should be drinking, you’re probably in the same spot I was — just winging it and hoping for the best. It takes 10 seconds to find out. Put your weight and activity level into our water intake calculator and see what comes up. You might be surprised how far off you are.
I was drinking about 40% of what I needed. No wonder I felt like garbage every afternoon.