Net zero water is an emerging research area that focuses on achieving a balance between water consumption and water replenishment in various systems, such as buildings, communities, and even entire cities. The goal of net zero water is to minimize the demand for freshwater resources by implementing water conservation measures, such as water-efficient fixtures and rainwater harvesting, while also replenishing water sources through techniques like wastewater recycling and groundwater recharge. This approach seeks to reduce water usage and promote sustainable water management practices to ensure a sustainable water supply for future generations.