Bottled water displays an expiration or best by date not because the water spoilsit doesn'tbut because the plastic container can degrade over time, potentially changing the taste or allowing tiny amounts of Does BAC Water Expire? The Truth for Serious Researchers Should BAC water be refrigerated or stored at room temperature? How to Store Bacteriostatic Water Safely Confused about whether BAC water needs refrigeration after opening? According to USP standards and Pfizer's own guidance, both room temp (2025C) and refrigeration are acceptable The Complete Guide on Bacteriostatic Water MedLab International