Fill a clear glass and hold it up to the light. If the water looks like a mini snow globe full of floating white specks, that's usually just harmless sediment or air bubbles. But if it's cloudy and doesn't clear up after sitting for a minute, you might have something more interesting lurking.
I once convinced myself my tap water contained tiny gremlins. Turns out, it was just hard water minerals—but the drama was fun while it lasted. Give it that visual once-over before you commit to drinking it.
