Uses of Bacteriostatic Water for Injections and Where to Get It BAC Water 101: Stop wasting it! Here's how to properly store and reuse your Bacteriostatic Water for peptides. Keep it clean. Keep it cold. Keep making progress. Tag someone who needs this 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 Etsy