Look, humans have survived for millions of years without Stanley cups and hydration calculators. Your body has a built-in, evolution-tested thirst mechanism. Unless you’re in Death Valley running a marathon, listen to your gut—or your throat. Drink when you’re thirsty, eat your fruits and veggies, and stop panicking about the perfect number of ounces.
But if you want a concrete number? Aim for 80-100 ounces a day (that’s 2.5 to 3 liters) if you’re an average active adult. For the imperial-minded folks, that’s about 5 to 6 full big water bottles. Or, in more relatable terms: drink enough so that you don’t feel like a dried-up raisin by 3 p.m. Your future self will thank you—and so will your skin, your brain, and the poor plants you keep forgetting to water.
