Pour water into a clean colored glass jar or bottle, then leave in sunlight or moonlight for a specific amount of time. The light passing through the colored glass will imbue the liquid inside with the energy of the color. People often drink color elixirs if the feel they are lacking the energy of that certain color.
If you cannot find a jar or bottle in the color you need, take a piece of colored paper and wrap it around the outside of a clear glass bottle or jar. Pour the water into the bottle and leave it for one complete moon cycle.