I tried searching everywhere but I can't get a straight answer. My plants are still pretty young and they are in 5 gallon pots. I know when to water and I let the top completely dry out and the first 2 inches. When it's time to water however, how much water do I give them? Keep watering until it starts draining from the bottom? Or is there a ratio like half of the the pot size or something like that?? Help please