Here is my step by step process...
Here's the drawing in 6B pencil on my 6x8" hot pressed watercolour paper.
I painted the waterfall while working from my trusty little paintbox. It's got my Cotman Travel Watercolour Palette in it. I used up the pan paint that it came with, then replenished it with artist quality tube paints, mostly Holbein brand.
Half way there... I like to add darks early, so I can determine the values right from the beginning. Artists often do watercolour from light to dark however, when I do that it never seems to get dark enough...
All done. You can see the pink bulldog clip on the right of the box holding a rag in place. There's also a few paper towels, a compact mirror (to look at the piece in reverse while painting) and I always bring an 8x10"mat to make sure the composition will fit nicely into a store bought frame when finished.