a container with a corresponding bottle neck having a capsule inside of which a substance is placed that is to be released into the bottle contents . this invention avoids having to sterilize the contents again after the container has been aseptically filled , even though the substance in the capsule often does not endure these temperatures . thus , this invention provides a method with the following steps : a ) aseptic filling of the plastic bottle ; b ) welding a first membrane onto the container neck ; c ) placing the substance , which is to be released into the plastic bottle , on the first membrane that is already welded on ; d ) covering the substance , which is to be released , by a second membrane and welding the second membrane to the first membrane . lastly , a closure with a secured tamper - evident layer is placed over the capsule and onto the bottle neck .