Goal: Conservation of drinking water by preventing use of good quality water in the section where it is not essential by doing some change in pipeline structure of household. Introduction: In general we use the same water in every section of consumption in household but in the section like toilets and comot pan flashing it is not essential that the required water should be a good quality water. It is seen in different servey that 25 % of the total water consumption is used in toilets and comot pan flashing in household. So, if we use the used water of bathing in such section like toilets and comot pan flashing,we can be able to save about 25% of good quality water in every day life. Procedure: If we implement the project in a multi stored building except top floor all the floor will get the used water automatically in the internal storage tank with out costing any energy and we can be able to save up to 25%of good quality water in every day life &as well as the energy required to produce such 25%of water.An internal storage tank is needed to be installed and some change in pipeline structure is required in household to implement the project as shown in the diagram.