This document provides a summary of a guided tour of a water desalination plant. It first defines some key terms and statistics about water on Earth. It then describes the desalination process and provides an overview of a visit to the Sydney desalination plant, walking through the water journey step-by-step. It also discusses the Sahara Forest Project, which aims to develop an integrated system for reforestation in desert areas using seawater greenhouses and solar power to provide fresh water.