Here are four sources of water:

1. Rivers: Rivers are natural flowing watercourses, usually freshwater, flowing towards an ocean, sea, lake, or another river.
2. Lakes: Lakes are large bodies of water surrounded by land. They can be freshwater or saltwater.
3. Groundwater: Groundwater is water located beneath the ground surface in soil pore spaces and in the fractures of rock formations. It is a significant source of drinking water. Source
4. Oceans: While saltwater, oceans represent a vast source of water. Desalination plants are used to convert seawater into potable water.