Water tank is an indispensable tool in rural areas as rain water storage for clean water because the water source other eligible difficult to obtain. These conditions not only occur in areas that are difficult to get water to dry land, but also the beach area to the tides. Therefore the container vessel is a building that is needed in very household. During the manufacture of water tanks by using iron reinforcement material woven wire, or better known as Ferrocement, but with the material requires a relatively high cost. Departing from this conditions, to assist the public in making water tanks need to created technologies applicable, pratical, inexpensive and environmentally friendly by utilizing local resources.