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Which option completes the text below correctly?
There are ________ different opinions on how ________ water you should be drinking every day.
Health authorities commonly recommend eight 8-ounce glasses, which equals about 2 liters, or half a gallon. This is called the 8x8 rule and is very easy to remember.
However, ________ health gurus believe that you need to sip on water constantly throughout the day, even when you're not thirsty.
________ factors (both internal and external) ultimately affect your need for water.