Container with secondary substance, preferably a liquid for attachment to and mixing with container of a primary liquid

Apparatus for housing and selectively adding a secondary substance to a primary liquid housed within an initially sealed primary container comprising a thin-walled hull, comprising:

• a housing containing the secondary substance;
• a frangible seal initially maintaining said secondary liquid within said housing;
• attachment means for mechanically and fluidly sealing and attaching said housing to the hull of the primary container in an orientation that places said frangible seal proximal to the hull of the primary container;
• and
• an actuable penetrator disposed at least partially within said housing and proximal to said frangible seal movable from a first position within said housing to a second position breaching through both said frangible seal and through the hull of the primary container while maintaining that said attachment means surrounds said penetrator at the location of penetration of the hull of the primary container;
• wherein moving said penetrator from said first position to said second position causes said penetrator to puncture the hull of the primary container, thereby allowing said secondary substance to mix with the liquid of said primary container.