My watercolour box is a very compact one. It’s a special travel box, made by “Daler-Rowney, England” with 18 fine arts quarter pans. I fill the brush space with some additive colours, as some transparent red, a very cool green, and gold watercolour.
If I had to choose 3 colours, my favourite are the yellow ocre, the alizarin crimson and the russian blue. I sketch figures only with those 3.
I've only used a “Pentel” water brush for a short time, but I’m already addicted to it. I always carry 2 of them full of water, to get enough autonomy for the day, and a third one fill of yellow ochre liquid watercolour to have a bright and luminous yellow (most of the watercolour yellow pans are opaque).