There are many reasons not to make your own watercolor. Not enough time. Lack of access to tools and materials. Besides, you can buy ready-made, ready-to-use watercolor and start painting immediately. And then there’s WHEEEEEEEE! I CAN MAKE MY OWN WATERCOLOR!!! Whee wins. Other people go to Katz’s, I proceed to Kremer. I’ve always wanted to take a …