A system of Clayolas connected to a water tank will let each plant draw the exact amount of water it needs. 80% more efficient than traditional watering and drip irrigation methods.
A system of Clayolas installed in planting pots and connected to a water tank will let each plant draw the amount of water it needs until the tank is empty.
You can recycle an old jar. An empty 20 liter water cooler container would be perfect.