Absolute Nutrition WaterShed. Absolute Nutrition WaterShed 60 tabs.Watershed combines all natural herbal extracts which have been designed to synergistically work together for maximum effectiveness. This makes it the most potent diuretic definer on the market today. Absolute Nutrition has carefully chosen herbs that are rich in "volatile oil constituents". These elements have a history of diuretic ability, and that's what Watershed delivers.