Regular water—the stuff from your tap, a spring, or a well—is basically nature’s cocktail. It’s got water, sure, but also a bunch of minerals like calcium, magnesium, and sometimes a pinch of iron or fluoride. Think of it as water with personality.
Your local water treatment plant gives it a little makeover to kill germs, but the minerals mostly hang out. That’s why hard water leaves those crusty white spots on your dishes—it’s just calcium showing off. And hey, that trace of fluoride? It’s the reason your dentist doesn’t yell at you as much.