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Using thirst as a guide to how much water you need to drink is a good way to ensure your individual needs are met everyday. http://articles.mercola.com/sites/articles/archive/2014/12/15/drinking-enough-water.aspx

Your body is equipped with a mechanism that tells you when you need to replenish your water supply. It's called thirst. And there's also a simple way to gauge whether or not you need to drink more water even though you may not be feeling thirsty.