The discussion centers on the use of rainwater and seawater as alternatives to traditional potable water sources, questioning the concept of water wastage. While rainwater can be collected and used, it often contains pollutants and requires treatment to be safe for drinking. Seawater, although abundant, poses challenges for desalination, which is costly and energy-intensive. The conversation highlights that wasting treated water incurs financial costs and environmental consequences, as it can lead to pollution and increased sewage treatment expenses. Additionally, the availability of clean water varies by region, with some areas facing severe shortages despite having access to freshwater sources. The complexities of water rights, treatment costs, and the need for sustainable water management are emphasized, along with the importance of maintaining public health through proper water sanitation. Overall, the thread argues for a more responsible approach to water use and management, recognizing that both rainwater and seawater have limitations and require careful consideration in their application.