Here are four case studies I developed to teach the key concepts of water access, security, aquatic food production, and water pollution for ESS topics 4.2, 4.3, and 4.4. The case studies cover a range of geographies and economic development: The Water Wars in Cochabamba, BoliviaSouth Africa's Free Basic Water PolicySalmon Farming in NorwayFreshwater Shrimp Production in ThailandEach case study includes a map, a timeline, numerical and graphical data, photos, and background context. They are de