Water testing notes from 2024

See Laura's doc with pictures: https://docs.google.com/document/d/17kOsFm8z-yfbIwxfkXhM-hIp2vIntZ2DCA08Mils6Pc/edit?usp=sharing
See Eliza's doc: https://docs.google.com/document/d/1-1Z6DhpWmhmLm4YH72OH02nbolKv28d-CwceZOJO9mc/edit?usp=sharing