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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.
If you are very active, you may need to drink two-thirds of your body weight in ounces instead. For example, a 150-pound athletic woman should consume almost 100 ounces of water per day, which is 12.5 cups of water each day. If you are exercising for longer than an hour, you may lose too much fluid and electrolytes to be replaced solely with water.