This report assesses the conditions under which a global Water Grand Strategy (WGS) might be created and implemented by stakeholders in the United States within the next one to two years. While numerous American organizations are addressing water challenges the world over, no explicit policy or vision coordinates their multiple endeavors. As a result, the United States does not maximize its influence in finding solutions to the world's most pressing water challenges. This report evaluates the need for a WGS and explores the possible ends of such a strategy. It summarizes what the United States is already doing in the water space, and identifies the current model's strengths and weaknesses. It outlines a process for forging a "Whole of America" water strategy—a stakeholder-driven process—and addresses key implementation challenges. This report is part of an Atlantic Council/US Water Partnership (USWP) collaboration on global water security challenges. Leadership within both organizations believe that the US government should elevate global water challenges to the top of its priority list. Both organizations maintain that global water security challenges will become increasingly critical, including within countries and regions that are of the highest geostrategic importance to the United States.