Don’t fear heavy water. Fear dog water that’s too hard. Or worse: no water at all.
Next time you fill a glass, think about it. Is it hard? Is it heavy? Or is it just H₂O, doing its thing?
Spoiler: It’s almost certainly just hard water. And that’s fine. Your coffee maker will forgive you.
Now go hydrate. Preferably with something light. And not radioactive.