Watercolor using Distilled water and Mediums So with watercolor painting for some reason there is a lot of misinformation out there and other information that is completely lacking. Three of the most misunderstood subjects is using watercolor mediums and the use of distilled water vs. tap water. Let’s start with using distilled water to thin your paints. I have heard the rumors that using distilled water is superior to using tap water since I began watercolor painting back in high school. I have…