i spent 73 dollars total for enough parts for two watering systems. meaning enough supplies for twelve tubs. i bought 12 t joints, 2 L joints. 2 connection valves, 12 clips for the 12 nipples, and for some reason i dont know what i was thinking at the time but i bought 40ft of the 3/16 tubing.... and the bucket came with my previous purchase of kitty litter!

Edit: i just finished the second rack today with mortar tubs. the watering system will be done when the next kitty litter bucket is empty!