Seriously, who came up with that? That number is a one-size-fits-none relic. Your hydration needs depend on your body, your sweat rate, and whether you just ate a salty bag of chips (yes, that matters).
The real trick is to listen to your body’s cues. If your mouth feels like cotton, you’re already behind schedule. A better rule? Sip throughout the day, not just when you’re thirsty. Thirst is a late alarm.
Check your pee. Yes, your pee. It should be the color of pale lemonade. If it’s dark like amber ale, grab a glass. If it’s clear like a swimming pool, you’re overdoing it—and that’s actually dangerous.
