Abstract: A bed bath system having a mattress with a bed surface and mattress wall periphery about the bed surface; a support member having an inner wall sized and configured to contact and encircle the mattress wall periphery; a fluid impermeable sheet having a first side disposable on the mattress and an opposing second side, the sheet disposable in the support member to form an envelope on the second side, the envelope having a floor coplanar with the bed surface, a lateral wall coplanar with the support member inner wall, and a bath space interior to the lateral wall and the floor; an infusion reservoir with a dispensing port to dispense a bathing fluid; a nozzle in fluid communication with the dispensing port operative to emit bathing fluid into the envelope; and a drainage port positioned to drain waste fluid from the envelope.