You can use a drip irrigation system with a 4-inch tube running from the water tank to my pots. I have found that it is best to set the timer on the drip system to run for about 15 minutes before setting it to turn off. I do this because I don't want to waste water by having the drip system run all day. I have also found that the drip tubing needs to be replaced every six months or so. I use PVC tubing that comes in 2-, 3-, and 4-inch sections. I use a hose bib to connect the tubing to my water tank and then to my drip irrigation system. I have attached my drip system to a PVC tee and then connected the other end of the tee to the bottom of my pots. I have also attached an extension piece to the top of the pot. The extension piece allows me to easily remove the pots and move them around. This way, if I want to rotate the plants, I can move them without having to take them out of the water.