A device and method are provided for storing medicaments and foods and/or beverages separately during shelf life, and for mixing the medicaments and foods and/or beverages when ready for use. A body of the device defines a plurality of first chambers for receiving a medicament, and a plurality of second chambers for receiving a food and/or beverage. A first sealing portion is located between the first and second chambers and is movable between a closed position preventing fluid communication between the chambers, and an open position permitting fluid communication between the first and second chambers for mixing the medicament and the food and/or beverage when ready for use. First and second penetrable and thermally resealable portions are in fluid communication with the first and second chambers, respectively, and are penetrable by an injection member to form an injection aperture therethrough and introduce the medicament or the food and/or beverage through the injection member and into the respective chamber, and are thermally resealable to seal the injection apertures and the medicament or food and/or beverage within the respective chamber by applying energy thereto.