Exercise is the obvious culprit: sweat = water loss. A good rule? Drink 17–20 ounces two hours before a workout, then sip every 15 minutes during. Afterward, guzzle another 8 ounces for every 30 minutes of sweating. (Science says so, not me—I just like the sound of “guzzle.”)
Got a fever, diarrhea, or a hangover? Double down on water. Your body is basically throwing a tantrum, and hydration is the pacifier. Also, coffee and tea count—yes, even with caffeine. They’re not dehydrating you like a cursed vampire; they’re just slightly less efficient than plain water.
The Secret Weapon: Your Body’s Signals
Here’s a fun experiment: When you feel tired, grouchy, or headachy, try a glass of water first. Often, you’re just dehydrated, not a bad person. I once yelled at a fridge because it was empty—turns out I just needed 8 ounces of H2O. (The fridge forgave me.)
Water Intake Calculator - How Much Water Should You Drink?