I am using a 18 gallon container (Tuff Tote version) and six 3 inch net pots (55 cents each at Worms Way). I am using coconut coir for growing medium and some hard water liquid fertilizer also from Worms Way. I am growing 6 pepper plants.
If all goes well with this version of the experiement, I plan to switch to a more organic version of nutrient going forward. Worms Way has a large variety of seabird guano nutrient available.
The most difficult part of making this DIY system was cutting the holes.
I plan to upgrade to a better pump later, but for now I'm using an Aqua Culture pump that I had on hand. A better pump from Worms Way goes for $16.