How to water a Kokedama
In watering a kokedama, weight is a good indicator of when a kokedama needs watering.  Hold the kokedama in your hands and see if it is heavy and damp, if so, that means it has enough water.  If it feels light and dry, them watering is needed.
Place the kokedama in a vase or bowl, then fill with enough lukewarm water to cover the kokedama ball and water level reaches the plants stem.  Bubbles will start to rise to the water surface.  Soak it for at least 15 to 20 minutes and up to 1 hour.  When the watering time is complete, remove the kokedama from the water and let it drain.  Water once a week.  Note plants like the Snake plant only require watering every 10 to 14 days.