An apparatus including means for measuring and storing flow information for a fluid flowing through each of a plurality of fixtures in a single unit in a multi-unit structure, and each means for measuring and storing operates independently of all other means for measuring and storing and means for generating and storing power from the fluid flowing through each of the plurality of fixtures. The apparatus also may include means for transmitting in a wireless transmission the flow information with a unique identifier associated with each of the plurality of fixtures having sufficient stored power to transmit the flow information and means for accumulating the flow information in a storage area for each of the plurality of fixtures with insufficient stored power to transmit the flow information.