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To stay adequately hydrated, you should drink approximately three quarts (96 ounces) of water a day. For weight loss, you should drink an additional 8 ounces of water for every 25 pounds you are over your ideal body weight. Also, water consumption should be increased in hot climates or during vigorous exercise. Please note; water will not cause you to lose weight alone.
Drinking a gallon of water a day, or 4 liters, is what I recommend to people who are trying to lose weight. A gallon of water a day helps keep you full, flush your system, increase your metabolism, and other benefits of drinking water.