How to Store Bacteriostatic (BAC) Water Temperatures, Do's & Don'ts, vialcase.com Pfizer Bacteriostatic Sterile Water for Injection USP 30 ml Med Supplies Pfizer Bacteriostatic Sterile Water for Injection USP 30 ml vial 25 Box Med Supplies Pfizer Hospira Bacteriostatic Water 30 mL Peptide Test 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