A feeding bag system and method of preparing a feeding system is described. The system can include an adapter cap having a threaded portion for threadbly receiving the feeding bottle, a funnel-shaped portion having a tip portion configured to cooperate with an enteral feeding tube, a vent passageway disposed through the adapter cap, and a fluid passageway disposed through the funnel-shaped portion. The system can also include a bag configured to be suspended by a medical hanger. The bag may include walls defining an inner cavity, an upper opening for positioning the feeding bottle therethrough, and a sealed lower portion. The sealed lower portion can include an aperture configured to receive a portion of the adapter cap therethrough.