What kind of water

"Heavenly Water"

That's a concept this book introduced to me.

https://www.thriftbooks.com/w/ancient-healing-for-modern-women-traditional-chinese-medicine-for-all-phases-of-a-womans-life_xiaolan-zhao/301375/#isbn=0802715672&idiq=1879408

Even found out it's borrowable online.

https://archive.org/details/isbn_9780802715678