Doesn't exactly quench your thirst, apparently.
We generally shy away from a glass of water if its been on the nightstand for more than a couple of nights but scientists in Canada are all for drinking old water. Actually, it's just one scientist. The LA Times reports that Barbara Sherwood Lollar, an Earth sciences professor at the University of Toronto, recently admitted to tasting some of the world's oldest water.
Canadian scientists recently discovered water that has been lying undisturbed beneath the Earth's surface is over a billion years old. In a report about the find, Lollar reveals that she's tasted the water multiple times. It's bad, in case you were wondering. Why would anyone ever drink something they found 1.5 miles below the surface of the Earth? Duh, for science. Speaking to the LA Times, Lollar explained that the saltiest waters are the oldest and the "quick and dirty" way to test for saltiness is to taste the water. She compared the consistency to a very light maple syrup and said it's saltier than seawater.
Geologists have known about the pockets of water, which lie underground in Timmins, Ontario, since the 1880s but the age of the water wasn't known until recently. You can read more about the water in Lollar's LA Times interview.