Water security is one of the most pressing challenges of the 21st century, exacerbated by climate change, population growth, and urbanization. Increasing droughts, rising sea levels, and shifting rainfall patterns have strained freshwater resources worldwide, demanding innovative engineering solutions to ensure resilience. Sustainable desalination technologies, advanced recycling systems, and efficient distribution networks are central to addressing these challenges. This paper examines engineering strategies for sustainable water management, focusing on energy-efficient desalination, closed-loop recycling technologies, and intelligent distribution systems. By integrating these approaches, societies can build resilient water infrastructures capable of meeting the demands of a changing climate and safeguarding future generations.