Playing around with the paint and water will help you gain more experience of watercolor painting. If you use a lot of water and not much paint, the tone of the color produced will be transparent, pale, and subtle.
If you mix the paint with just a little water, the tone will be dark and vibrant.
The exciting thing about watercolors is that they run into each other in a way that cannot be predicted, and this can produce fascinating and unusual color sequences. The results are completely different every time, depending on how much water you use. You need two essential painting techniques for watercolor painting: washing and scumbling.
You can use the lid of your box to mix the paints, but ceramic or plastic artist’s palettes can also be used.