> It's hard to think of any civilizations that relied on mostly rainwater, but maybe I haven't heard of any. I think that the Maya mainly relied on capturing r

> It's hard to think of any civilizations that relied on mostly rainwater, but maybe I haven't heard of any. I think that the Maya mainly relied on capturing rainwater for their water needs. I assume this would have included drinking water. https://cnnespanol.cnn.com/2012/07/18/los-mayas-resolvieron-el-problema-de-la-escasez-de-agua-hace-mas-de-mil-anos/ https://cnnespanol.cnn.com/2012/07/18/los-mayas-resolvieron-... (in Spanish) https://www.discovermagazine.com/the-sciences/maya-water-system-discoveries-show-the-ancient-civilization-in-a-new-light https://www.discovermagazine.com/the-sciences/maya-water-sys... (in English)