This disclosure relates to systems, methods, and compositions for dispensing multiple compositions into a plurality of containers or atmospheres. In one embodiment, this disclosure pertains to treating and preventing offensive odors arising from toilets. The system includes a base station with at least one bag-on-valve (BOV) canister, which holds one or more compositions. A tube leads from the output of the bag-on-valve canister to a bowl clip and/or to a spray nozzle. The bowl clip can be mounted to a toilet bowl. One example embodiment of the invention includes a bowl clip with a sensor that initiates release of the composition(s) from the bag-on-valve (BOV) canister(s), while another embodiment initiates release of the composition(s) from the bag-on-valve (BOV) canister(s) using a motion sensor or activation switch. The compositions are delivered to treat and prevent offensive odors.