Healthcare facilities depend on an uninterrupted and safe water supply, which functions as a critical clinical resource rather than a mere utility. Essential hospital services, such as intensive care units, operating theaters, hemodialysis, and sterile processing, are fundamentally reliant on water for safe operation. Evidence from international bodies and experiences from water-scarce regions highlight the swiftness with which patient safety is compromised during water outages or contamination events. Many healthcare centers, including major hospitals, are vulnerable to failures in municipal supply or internal infrastructure. Conventional reactive strategies, like stockpiling bottled water or using paper-based emergency plans, are inadequate for managing the dynamic and complex nature of a water crisis, which requires balancing clinical priorities against engineering constraints. This chapter puts forward a conceptual framework for a hospital water digital twin, designed as a policy-oriented decision support tool to enhance resilience. The proposed architecture integrates three core elements: (1) a hospital-specific model of water distribution and storage; (2) a curated library of disruption scenarios based on local risks and expert knowledge; and (3) a multi-objective analysis engine to evaluate trade-offs between clinical service continuity, water conservation, and safety standards. The framework translates this technical analysis into actionable operational tiers and clear governance protocols. This work is presented as a conceptual prototype; it does not offer performance results from a deployed system. We openly acknowledge the significant practical barriers in settings like Saudi Arabia, including data integration issues and the high cost of sensor networks. The purpose of this chapter is to provide health authorities with a more transparent and clinically guided approach to developing water-resilience strategies.