Lowtech Graph lists low-tech options for every need of a home. Here you can compare them, find tutorials to build them, and link them together into a circular system. Why low-tech?
Rain as it comes off a roof or the ground, before any treatment. Collected and stored, it can flush toilets, water the garden and wash clothes, and becomes drinking water once treated.
It arrives on the site on its own. Nothing in the catalogue makes it. In the builder you add it as “Rainwater”.