I used a Koi Waterbrush (fill the handle with water) for the first time. It stays wet and I used 1/3 a 'handle full' of water for this painting however, it is very difficult to control the amount of water that comes out. It's the medium size from Curry's Art Store for about $7.
The portable 12 pan Winsor Newton watercolour set is great for sketching. Super duper portable and I had lots of fun.