Bacteriostatic Water vs Reconstitution Solution Guide Does Bottled Water Expire? How to Tell if Water Has Gone Bad Does purified water go bad if not stored in the fridge? Does Water Expire? What You Should Really Know 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