An apparatus for filling a plurality of containers with a fluid. The apparatus including a connector configured to removably couple the apparatus to a fluid source, a flow path providing fluid communication between the fluid source and a plurality of containers coupled to the apparatus, a sealing element disposed within each of the plurality of containers, the sealing element configured to couple the container to the apparatus and automatically seal the container when the container is decoupled from the apparatus, a retaining member including a sleeve affixed to each of the plurality of containers, to position the sealing element in a neck of each of the plurality of containers, the sleeve being configured to prevent radial expansion of the containers, and, a mixing mechanism disposed in the flow path and configured to receive an additive and introduce the additive in to the flow path.