Ever notice how tap water in New York tastes like a crunchy bagel, while London water tastes like a rock licked a chalkboard? That’s because geology is your bartender. Water picks up minerals from the ground it travels through. In some places, it tastes like a swimming pool (hello, chlorine). In others, it’s so pure it makes you feel like a spa robot.
Fun fact that will make you sound smart at parties: the ancient Romans added lead to their water pipes on purpose—not for flavor, but because they thought it added sweetness. (Spoiler: it also added brain damage. Roman tap water was a murder-holiday).