Alternative water sources refer to non-traditional methods of obtaining water, often used to supplement or replace conventional sources like rivers and groundwater. These sources can include rainwater harvesting, where rain is collected from roofs and stored for later use, and desalination, which involves removing salt from seawater to make it drinkable. Another common alternative is the use of recycled water, which is treated wastewater repurposed for irrigation, industrial processes, or even drinking after thorough purification. These methods help address water scarcity and promote sustainable water management, especially in areas facing drought or limited freshwater resources.