Please excuse my ignorance as I'm definitely not a mechanic. So my check coolant level came on this evening. This happened before about 2 months and I took it into the local BMW dealer to get a top off. As I recall, they just filled it with water. So tonight, I did the same. Now, I seem to recall that they had used distilled water not tap.

Question...Did I make a big mistake or am I safe for a day or so? Quick responses are greatly appreciated as I need leave for a 3 hour one way trip in about 6 hours.