This is a complete 4-week art unit all in one PowerPoint (approx. 2-3 sessions per week). It goes through the colour wheel, what watercolour paints are, brush grip, materials, basic brushstroke techniques, basic washes. It also has art-making and art appreciation activities to go with each new concept/technique learnt.
This was used with a team of grade 1/2 classes. It was difficult with these young students, but we got excellent results. It would probably be best suited to Grades 3-6. The unit could be spread out over a term if desired as there is a lot in it!