Almost all watercolor books that I own have a sketched watercolor materials/kit and somehow, whenever I saw one, I wanted to sketch mine too and told myself to do it after finished reading the book, but never did. This happened every time I bought new watercolor book, until yesterday I finally sketched my own kit, not all though.
This brush I bought in Sekaido store near Machida train station 4 years ago and I still use it. Super love it.
~ A palette, paper, brush, some color tubes and you're ready to paint. But hey, don't forget the water! ~