Containers are especially adapted for the reconstitution and dispensation of concentrated or powdered products. The containers preferably include a sealed flexible pouch body defining an interior space; removable primary and secondary seal regions which seal primary and secondary openings into the interior space of the pouch body, and a resealable closure member provided adjacent the primary seal region for reseating the primary opening upon removal of the primary seal region. A strip thermometer may be physically attached to the pouch body so as to provide visual temperature indication of the reconstituted liquid product within the container. The containers may be prepackaged with a desired amount of concentrated or powdered product for later reconstitution. In use, the primary seal region may be physically removed and the resealable closure member opened so to expose the primary opening to the interior space of the container. A reconstitution liquid may then be introduced through the primary opening and into the container's interior space. Resealing of the primary opening by the closure member allows the product to be mixed with the reconstitution liquid. Thereafter, the secondary seal region may be removed to allow access to the reconstituted liquid product through the secondary opening.