A device (10; 110) for producing for immediate intravenous administration to a patient (56; 156) a medically-deliverable intravenous saline solution from a source of water, the device comprising: a housing, the housing defining an inlet (20; 120) and an outlet (22; 122), the inlet (20; 120) attachable to the source of water for receiving water therefrom; a conduit through the housing extending from the inlet (20; 120) to the outlet (22; 122); a purification device (30; 130) located within the housing along the conduit downstream of the inlet for purifying the water received from the source of water; a pump (28; 128) within the housing for pumping the water through the conduit; a container (38a; 138a) connectable to the housing holding a concentrated intravenous saline solution, the container (38a; 138a) having an outlet in communication with the conduit; a metering device for dispensing the concentrated intravenous saline solution from the container (38a; 138a) into the water within the conduit; and a mixing chamber (54; 154) along the conduit downstream of the purification device (30; 130) and the metering device and upstream of the outlet, the water pumped by the pump (28; 128) and the concentrated intravenous saline solution dispensed by the metering device being housed in the mixing chamber (54; 154) before passing through the outlet (22; 122); characterized in that the device further comprises: an intravenous infusion kit (24; 124) in communication with the outlet (22; 122) for use in the immediate intravenous administration of the medically-deliverable intravenous saline solution to the patient (56; 156); and a controller (36; 136) connected to the housing, said controller configured to control the pump (28; 128) and the metering device so as to create the medically-deliverable intravenous saline solution from the water and the concentrated intravenous solution within the conduit and to deliver the medically-deliverable intravenous saline solution to the infusion kit (24; 124) via the outlet (22; 122) for immediate intravenous administration to the patient (56; 156) via the infusion kit (24; 124); wherein the housing supports the conduit, the purification device (30; 130), the pump (28; 128), the container (38; 138), the metering device, and the controller (36; 136) in a portable handheld unit. a housing, the housing defining an inlet (20; 120) and an outlet (22; 122), the inlet (20; 120) attachable to the source of water for receiving water therefrom; a conduit through the housing extending from the inlet (20; 120) to the outlet (22; 122); a purification device (30; 130) located within the housing along the conduit downstream of the inlet for purifying the water received from the source of water; a pump (28; 128) within the housing for pumping the water through the conduit; a container (38a; 138a) connectable to the housing holding a concentrated intravenous saline solution, the container (38a; 138a) having an outlet in communication with the conduit; a metering device for dispensing the concentrated intravenous saline solution from the container (38a; 138a) into the water within the conduit; and a mixing chamber (54; 154) along the conduit downstream of the purification device (30; 130) and the metering device and upstream of the outlet, the water pumped by the pump (28; 128) and the concentrated intravenous saline solution dispensed by the metering device being housed in the mixing chamber (54; 154) before passing through the outlet (22; 122); characterized in that the device further comprises: an intravenous infusion kit (24; 124) in communication with the outlet (22; 122) for use in the immediate intravenous administration of the medically-deliverable intravenous saline solution to the patient (56; 156); and a controller (36; 136) connected to the housing, said controller configured to control the pump (28; 128) and the metering device so as to create the medically-deliverable intravenous saline solution from the water and the concentrated intravenous solution within the conduit and to deliver the medically-deliverable intravenous saline solution to the infusion kit (24; 124) via the outlet (22; 122) for immediate intravenous administration to the patient (56; 156) via the infusion kit (24; 124); wherein the housing supports the conduit, the purification device (30; 130), the pump (28; 128), the container (38; 138), the metering device, and the controller (36; 136) in a portable handheld unit. an intravenous infusion kit (24; 124) in communication with the outlet (22; 122) for use in the immediate intravenous administration of the medically-deliverable intravenous saline solution to the patient (56; 156); and a controller (36; 136) connected to the housing, said controller configured to control the pump (28; 128) and the metering device so as to create the medically-deliverable intravenous saline solution from the water and the concentrated intravenous solution within the conduit and to deliver the medically-deliverable intravenous saline solution to the infusion kit (24; 124) via the outlet (22; 122) for immediate intravenous administration to the patient (56; 156) via the infusion kit (24; 124); wherein the housing supports the conduit, the purification device (30; 130), the pump (28; 128), the container (38; 138), the metering device, and the controller (36; 136) in a portable handheld unit.