A package for a liquid which is purified includes a neck with a lock-chamber slidable therein. The lock-chamber includes a purifying substance through which the liquid passes when dispensed. At one end of the lock chamber, a plug is positioned to block passage of the liquid through the lock-chamber when...http://www.google.com/patents/US5249712?utm_source=gb-gplus-sharePatent US5249712 - Packaging for altering the composition of a liquid
