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 Bacteriostatic Water UMBRELLA Labs Bacteriostatic Water Bac Water by Hospira Mountainside Medical Bacteriostatic Water, Sterile Should BAC water be refrigerated or stored at room temperature? Bacteriostatic Water Bac Water by Hospira Mountainside Medical