Water has become a global problem and its implications are emblematic of the future challenges to humanity''s peaceful coexistence and even survival. According to UNDP more than 1 billion people are denied the right to clean water and 2.6 billion people lack access to adequate sanitation. These numbers show the magnitude of the problem. However, Robert Malthus fears have proven wrong for a long time. Today''s roots of malnutrition, hunger and thirst are solely to be found in an unequal distribution of resources in the World and the lack of will of governments to bridge the gap. This gap is particularly visible in the fragmentation of international law among its numerous families such as international investment law, environmental law, trade law or human rights law. The purpose of this legal dissertation is to develop a single innovative and coherent approach to Public International Law using Human Rights Law as a tool to bridge these gaps and inconsistencies which threaten people''s basic access to water.