Here is my basic watercolour kit that I use while traveling. 3 Escoda brushes (Charles Reid signature), 1 Pentel Twist-Erase 0.9 pencil with HB lead, W&N Field box, water spray, water pot, putty rubber and Hero calligraphy pen.
I still consider myself to be a newbie so my kit will change I am sure as learn more about watercolouring.