Is it healthy drinking eight glasses of water a day?

Drinking eight glasses of water a day is a myth, probably born out of a 1945 Food and Nutrition Board recommendation

According to Dr. Aaron E. Carroll, a pediatrician also writing for the New York Times, drinking eight glasses of water a day is a myth. Dr. Carroll wrote a paper on medical myths eight years ago, and two years later he co-wrote another study, specifically on the eight-glasses-of-water-per-day myth. Dr. Carroll says that people should drink according to their individual needs, they don't have to drink "eight glasses of water daily." It's just not true. There is no science behind it. The source of this myth was probably a 1945 Food and Nutrition Board recommendation, that said that people need about 2.5 liters of water a day. Too bad no-one paid attention to the sentence which followed the recommendation: "Most of this quantity is contained in prepared foods."
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People should drink according to their individual needs, they don't have to drink "eight glasses of water daily."
"For otherwise healthy people, drinking extra water has any health benefits," says Dr. Carroll, also reiterating that water is already present in vegetables, fruits, juice, coffee and beer.