What if you could, when putting soil in the pot, put a system of small tubes with many holes in them throughout the soil, with one final tube coming up and out of the soil, so when you water, you can just water directly into the tube, down INTO the soil, and the tubing system you put in will evenly distribute the water. Would roots be a problem? I mean, enough tubing and enough holes. . . . . . .or maybe a porous material that water can pass through but not solids? now i'm thinking!!!