A portable humidifier that comprises a base unit that produces mist and a connecting member (bottle adaptor) that detachably connects one or more types of reservoirs (disposable water bottles) to the base unit. The connecting member (bottle adaptor) includes a first connecting portion that detachably connects the one or more types of reservoirs (disposable water bottles) to the connecting member, a second connecting portion that detachably connects the connecting member to the base unit.