When using watercolour, change your water regularly. As soon as it starts getting discoloured, rinse out your jar and replace it with clean water. I usually have two jars on my drawing board. One to take off the paint on my brush, the other to get the brush really clean.
In the background you can see a silver container that I use to hold extra water whilst painting on location. I use both painting boxes whilst working outdoors. The smaller of the two also contains water.
I found this plastic model of Morph whilst walking my dog. The animated Morph used to feature in Tony Hart’s television program Take Hart which was an inspiration to millions of children including myself. He passed away at the age of 83 in January 2009. You can still see some clips of Tony on YouTube.