Water shortages are a growing problem around the world, especially in developing countries. Desalination, or turning seawater into potable water, is one way of increasing water supplies, but desalination plants require vast amounts of energy and infrastructure. Now a Japanese team has developed Courier Water, a mobile desalination unit that has tremendous potential for helping people in areas affected by water shortages or natural disasters. The unit’s defining feature is its mobility. With its compact design, Courier Water can be installed on a four-ton truck, allowing it to travel far and wide.