Abstract: An apparatus and a method for conserving the volume of water consumed during the flushing of waste deposited in the bowl of a toilet. A secondary water reservoir is mounted externally on the primary water reservoir of a conventional toilet. The primary water reservoir holds a first body of water whose volume is greater than a second body of water held by the secondary water reservoir. The first body of water may be discharged from the primary water reservoir directly into the bowl. Alternatively, the second body of water may be discharged from said second water reservoir into a water feed member which is mounted externally on the rim of the bowl and which directs said second body of water into said bowl along its perimeter in a slight downwardly direction.