That's very clever! Thanks for sharing!All that is is a self-watering pot. So I made mine: there are a lot of youtubes on how to make them.
I made mine by taking a large plastic bucket, drilling a hole in the side 4 inches from the bottom. THEN you need to prevent your plants from getting wet feet: I did it by putting a flower pot upside down in the bottom of the pot and putting the potting soil on top of that. And, yes, you do need potting soil for the system.
When you water, the water will fill up the lower 4 inches up to the hole that you have drilled. Because of the upside down flower pot a lot of water is being held. The water then wicks up to the plant and keeps the plant happy: I only had to water mine once a week and less often if it rains. And, the rain did not fill up the entire bucket because of the hole I drilled 4 inches up.
I like them because I can have cucumbers and such outside my kitchen door, which means that I can grab a cucumber or whatever to add to the evening meal without walking down the stairs to the main garden: I have slowed down a bit since I was a young woman!