Imagine your humidifier is a fancy sports car. Tap water is like filling the tank with cheap, watery fuel. It’ll run, but you’ll get nasty sludge, a weird smell, and the mechanic will hate you.
Distilled water is that premium, crystal-clear racing fuel. Plus, your engine purrs, there’s no residue, and your car feels zen. You wouldn’t skip on the good stuff for your car, right? So why do it for your indoor air?
But hey, if you’re driving a beater humidifier from the thrift store, go ahead and use tap. That thing has already seen some things.