half your weight in oz. So for a 250 lb person 1/2 is 125, so the answer is 125 oz of water. Now that would be higher if you are an active person. I ran 5 miles this morning, and I weigh about 250, but the amount of water I need to replace lost water while running is way more than 125 oz. This rule only works on people with seditary lifestyles.
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