Uses of Bacteriostatic Water for Injections and Where to Get It Here is how you reconstitute any peptide There is no universal formula for reconstituting peptides. The amount of bacteriostatic water you use depends on the peptide, the dose you're running, and how Can Bacteriostatic Water Expire or Go Bad? Wittmer Rejuvenation Clinic 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