Exercise changes everything. Lose a liter of sweat per hour? You need more. The general rule: 17-20 ounces (2-2.5 cups) two hours before, then a few sips every 15 minutes of activity.
Hot weather? Double it. Sick with a fever? Triple it. High altitude like Denver? You’re peeing dry air faster than a hair dryer. Drink up.
Pregnancy and breastfeeding add a whole new layer. A nursing mom needs an extra 3 cups per day. That’s milkshake-level hydration effort.
Quirky Fact: Your Water Bottle Is a Liar
Fitbits and phone apps overestimate your needs. They say “Drink 64 ounces!” but you might only need 48. Trust your body more than a gadget.
Also: expensive “alkaline” water is a scam. Your stomach acid is stronger than any fancy pH. Regular tap water works great.
Ice-cold water burns 8 extra calories an hour from warming it up. That’s one Cheeto worth of effort. Not a weight loss hack, but fun trivia.
