Module 1. Introducing concepts of public health and safe drinking water) This activity marks the end of the first module in this topic. Before you move on, take time to ensure that you feel able to meet the first learning outcome ‘Describe public health issues relating to the supply of safe drinking water’. One acid test of whether you can meet this outcome is to · Think of someone you know well – could be a relative or close friend – who does not share your work-related interests ·