I agree that the difference may be negligible but as a professional I always recommend distilled or ionized water. You never know when a warranty claim may happen & we all know how fragile a warranty can be when it comes to the vendor finding a way to get out of it.

I once had my battery vendor accuse my customer of topping off their pallet jack battery with pickle juice since that was what business the customer was in & the battery failed with about 6 months. I had to get the battery acid tested (which the battery vendor paid for in the end) to prove no such additive was in the acid. Had there been any minerals in the acid I'm not sure the warranty claim would have gone thru.