How Old is the Water We Drink?

Back in 2016, geologists from the University of Toronto announced they had discovered water at the bottom of an old mine in Canada that was 2 billion years old. The claim was based on the presence of dissolved salts and noble gases, which suggests how long the water had been isolated. However, the water itself must be at least 2 billion years old but this work did not reveal when it formed. So how old is this water or indeed, any of the stuff we drink?-- More...