A complete overview about drinking a gallon of water in a day Maybe you’ve seen a hydration challenge floating around the internet, or you’re just looking to amp up your daily water intake. Is drinking 1 gallon (3.8 L) of water all that it’s cracked up to be? And if so, how can you hop in on the trend? Don’t worry—we’re here to quench your thirst for knowledge with plenty of expert-verified tips, tricks, and helpful answers to your FAQs. [ Edit ] Things You Should Know Increase your daily water intake by carrying a water bottle around, infusing your drinks with fruit, and snacking on lots of fluid-rich foods. Multiply your weight (in pounds) by 0.5 to get a baseline of how much water you need to drink per day (in oz). Inspect the color of your urine. If it’s bright yellow or yellow-orange, you need to drink more water. [1] [ Edit ] Steps [ Edit ] Is it OK to drink a gallon of water a day? Yes, but you don’t need that much water to stay hydrated. A single gallon (3.8 L) is a...