This document provides guidance on using project-based inquiry (PBI) to build a global lesson plan on water. PBI is a student-centered approach that emphasizes hands-on learning and creative product development. Key aspects of PBI include asking compelling questions, activating prior knowledge, investigating resources, synthesizing and sharing learning, and reflecting. The document provides examples of how to structure a PBI lesson on water that examines access to clean water globally and potential solutions. Students would research issues, debate solutions, and create advocacy campaigns or demonstrations of their knowledge to share with others.