What is Bac Water? Bacteriostatic Water (BAC Water) is sterile water that contains 0.9% benzyl alcohol, which helps prevent bacterial growth. Used in research and laboratory settings for reconstitution and dilution. Visit 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 Bacteriostatic Water for Research Sterile Dilution Solution BPC 157 Healthy Balance Market Bacteriostatic Water: Complete Research Guide Ageless Vitality Peptides