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Thanks to OP, I found out about this clay pot watering system, watched some videos and decided to try it myself on my garden. Being in a 10b climatic zone (Italy), the summers can get pretty hot and dry, so what I'm trying to build now is a little veggie garden using this irrigation system. I could not find these specific "Ollas" clay pots they were using, but watching a video, I found out you could use a simple, conic shaped terracotta pot, which is extremely easy and cheap to get here. So I drew this little concept on inkscape, basically to explain my desired setup. The big problem I encountered was how to waterproof the bottom of these upside down terracotta pots. I thought about using an old PVC cloth I used for my garden pond. But even then, I need something to attach it to the pots without leaving any holes. I have no idea which glue could be used, It would have to be something very resistant to water and it should not leak toxic shit into the surrounding terrain. Any ideas on what glue could be used or other methods to seal these pots?