Here's my newest system. It's a recirculating system so it reuses the nutrient solution.
The pots have a hole in the center at the bottom and are designed to slip into a 3/4" PVC Tee an those act as the drains back to the nutrient reservoir.
The white hose on top is the supply line and has black micro tubing running into each pot to feed them.
The micro tubing is held in the pots by stakes (brown things)
Submersible pump in the bottom feeds the supply lines and it's hooked to a timer. Right now it runs 5 minutes at a time 3 times a day.
Here's some of the other stuff going on