What did the calcium ion say to the resin bead? “I’m getting de-attached, but I don’t feel so positive about it.” (Okay, chemistry humor is hard. I’ll stick to water.)
If you mess up and drink deionized water, don’t panic. You won’t turn into a dehydrated raisin. You’ll just pee out a few extra minerals and feel mildly insulted by the flavor.
One more pro tip: Label your water bottles. If you leave a jug of deionized water next to your regular water, someone will accidentally use it for spaghetti. And that’s just sad.