A storage stable package is provided that includes a polymeric bottle having a volume filled with an aqueous saline composition acidified with an acid to a pH of 2 to 9 and having a hypertonic saline concentration relative to saliva and blood, or an aqueous hydrogen peroxide composition acidified with an acid to a pH of 2.7 to 5.3 and having a hydrogen peroxide concentration 0.5 to 3 total weight percent, either to achieve a storage stability at 20 degrees Celsius of the composition of at least 10 weeks. The aqueous composition is independent of a synthetic antimicrobial. A cap is provided that is complementary a package opening for selectively sealing the aqueous saline composition within the volume. A process for treating an infection of a pharyngeal or buccal cavity is provided that includes rinsing with one of the aqueous saline composition. The aqueous saline composition is then expectorated.