my understanding is that bac water is the wrong PH and will cause the peptide to degrade quickly. I used .06% Acetic Acid and it worked great. I don't recall where I bought the AA, just googled it and bought it from some bullshit labs supply place. I actually had to buy 6% AA and dilute it with bac water to make it .06%. HCL might work, but I don't know shit about it.