The quantity of freshwater available per person in the world has been and continues to decrease due to a combination of factors, including population increase, water pollution, inadequate planning and management of transboundary and other shared waters, and inefficient operation of water supply and distribution systems. Consequently, there is an increasing potential for water scarcity, crisis and associated conflicts around the world in the future, especially in developing regions, if the current trend in water consumption and management practices continues. Climate change as a serious environmental, economic-social, psychological and political concern is also considered globally. In this fast-changing and highly-interconnected world, the problems related to water crisis and conflicts are numerous, complicated and challenging. Efforts to effectively resolve these problems require a clear vision of the future water availability and demand as well as new ways of thinking, developing and implementing water planning and management practices. First, comprehensive observations and evidences for the potential of available water, amount of consuming water separated by continents and also assessment of past, present and future of the world's water situation is investigated and for some applied strategies and guidelines are suggested as an integrated framework for adaption to climate change.