Abstract: A clean water conservation tank for a toilet providing a secondary clean water source to a toilet holding tank from a secondary holding tank mounted to a surface above and in fluid communication therewith. The secondary holding tank includes an outer container having an actuation body therein, a drain, a hollow puncture body attachable to the drain, and a portable internal container, or a substitute container such as a milk jug, removably disposed therein. The internal container has a one-way spring valve controlling the water level therein. Upon the engagement of the actuation body with the spring valve, the spring valve provides selective fluid communication between the internal container and the toilet holding tank. The puncture body, removably disposed within a cap inside the internal container, is used to puncture the substitute container for water flow through the drain and into the toilet holding tank.