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 When she found the BAC water in the fridge., happens to every gymbro eventually. you got the 28 day rule down, the slin pins are organized, the BPC vial is finally swirled (not shaken). then she opens How Do I Store Bacteriostatic Water? Solution Peptides BAC Down! Refrigerate Promptly and Properly