The complicated processes underlying water homeostasis, the consequences of change in water consumption on health and energy intake, weight, and human performance and functioning are all discussed in this study. Water is a vital nutrient that will kill you in days if you don't get enough of it. Because of the trend toward high amounts of fluids originating from caloric drinks, water's significance for the prevention of nutrition-related non-communicable illnesses has only lately been apparent. Nonetheless, there are significant information gaps in the areas of total fluid intake assessment, population hydration status, and few longer-term systematic treatments, with no published random-controlled longer-term studies. As an effort to encourage greater discussion on this vital issue, we offer several methods to evaluate water needs.