Water is the most-cited pathway through which countries experience climate impacts, and also the most-often prioritised sector through which countries seek to build resilience in their economies, their populations’ livelihoods, and their natural ecosystems, as indicated in a 2016 UNFCCC study of 162 Nationally Determined Contributions. Acknowledging that well-planned climate-responsive water management strategies and actions provide significant opportunity to build resilience, this NAP Water Supplement offers guidance for integrating water perspectives in countries’ NAP processes.