The drinking water supply faces major challenges: climate change, increasing periods of drought, and declining groundwater reserves are raising the risk of water shortages in certain regions. At the same time, demands are growing for supply security, crisis management, and a flexible, resilient infrastructure. At Fraunhofer ITWM, we develop mathematical models, simulations, and AI-based methods to make the drinking water sector sustainable for the future. Our goal is to make planning and operational decisions more informed, faster, and more sustainable.