Here is a great idea, combining rain water harvesting and drip irrigation.
A couple of articles I came across, that explain more about it.
It’s gardening time here in the southeast, and our thoughts return to watering. Rainwater is my favorite source of water, as it’s free, and takes no energy to.
There’s nothing new about the idea of a rain barrel to store water for future use. People have been catching and storing rain water for centuries and in many countries rain still provides the majority of the water for irrigation, …
Hopefully, these will give you some ideas that could help you.