According to the science YouTube channel Curious Minds, the amount of water on Earth has remained roughly the same for millions of years. This is taking into account the water that has moved around the world through precipitation. With this in mind, it is reasonable to say that a dinosaur had previously drunk every drop of water a person drinks on earth. For more further explanation on this claim, please click here:: Have YOU drunk dinosaur urine? Every glass of water contains almost 100% Jurassic pee, claim scientists