Vacuum negative pressure water feeding vessel appts

The utility model relates to a barrel type container with a build-in water storage bag. The shape and the volume of the water storage bag is similar to that of the barrel type container. A bag opening of the water storage bag can be extended out of the outside of the barrel type container opening and is sealed by a container cover. Gas exhaust bolts are arranged on one side of the container cover longitudinally and can be blocked or opened by a plunger piston. A breather bolt is arranged on the bottom side of the barrel type container and ventilating holes are arranged the breather bolt, and the ventilating holes can be sealed or opened by a piece of adhesive paper. The utility model has the advantages that air can not enter a water supply container under the states of discontinuity, succession or water supply waiting, and thus the pollution and deterioration of remanent liquid in the container caused by air can not be caused. The utility model is suitable for liquid conveying devices of water drinking machines and medical saline bottles.