Bottled water often carries an expiration or best by date, but pure water itself does not expire or spoil, as it lacks nutrients for bacteria growth. The date primarily concerns the plastic bottle: BAC Water for Peptides All You Need to Know The Peptide Blogger Buy Bacteriostatic Water for Research Licensed Peptides The Complete Guide on Bacteriostatic Water MedLab International CANLABS: Does BAC Water Expire? Have had for a year in fridge. : r Peptides