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Purified water is what you want and it matters not a jot how you get it. Simply put, tap water is mostly contaminated by various inorganic salts which makes it impure. You can remove the salts using distillation to get “distilled” water or by using ion exchange cartridges to get “de-ionised” water. The upshot is (to all intents and purposes) is exactly the same. Distilled water has been de-ionised!

Distillation is energetically less efficient and has H&S risks so is essentially not used these days.