How to Store Bacteriostatic (BAC) Water Temperatures, Do's & Don'ts, vialcase.com Should BAC water be refrigerated or stored at room temperature? Pfizer Hospira Bacteriostatic Water 30 mL Peptide Test You're probably storing your peptides wrong. Lyophilized (powder): Room temp OK short term, fridge preferred. Reconstituted: 2 8C mandatory. No exceptions. Never freeze reconstituted peptides. Use within 28 30 days after reconstitution. Protect from 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