So we all know that we should use distilled water. When we need to condition a humidor we put in a tray of "distilled" water. I also only use distilled water, but every time I use it I wonder why. I understand that there are minerals in non-distilled water but I would think that they would stay behind as the water evaporates into water vapor in the air. I would avoid putting tap water into a fancy humidification system but other than that ????? Can someone explain a good reason for using distilled water?