Bacteriostatic Water 30ML Bottle Simple Peptide Bacteriostatic Water Injection, Multiple Dose Vial 30 mL McGuff Bacteriostatic Water Bac Water by Hospira Mountainside Medical You should only be using Hospira branded bacteriostatic water to reconstitute your peptides. Not that Amazon stuff. None of that Chinese bac water stuff. Just Hospira. The difference between Hospira and other DID YOU KNOW? Bacteriostatic Water contains 0.9% benzyl alcohol, which prevents bacteria from growing after the vial is opened. This makes it safe to use for up to 28 days once punctured