A universal water purifier unitary assembly device comprising a device housing unit support structure, a manually operated air pump, a force-fed water filter cartridge of multiple separable stages and a separable sealing means to seal the junction and opening between said universal water purifier unitary assembly device housing unit support structure and water container of water to be filtered wherein junction and opening between of said water purifier unitary assembly device housing unit support structure and said water container is sealed to retain compressed air. Water of said container is filtered, treated and used as needed on demand as in a group environment wherein individual use and consumption of purified water is relevant. The water is stored in a container, being pumped from the container by compressed air provided by an air pump. Filter elements include sediment and cyst removal filters, ion exchange resins, semi-permeable membranes including a hollow fiber membrane, porous activated carbon particles and activated carbon blocks. The device housing unit support structure unifies the functional elements of the invention as an operational unit of easy transport for use with any water container of a suitably sized mouth.