Sterile water is no good. Your HCG will be dead in 24 hours. If you are in the US, you can find Bac water online at a variety of places. Even Ebay will have it. Not sure about other countries. Another option is .06% acetic acid preparation for injection which is used for IGF. I believe that NAC will work a little longer than steroid water but I would not trust it. If you can find Bac water, I would suggest breaking your HCG down into 250-500iu shots 2x wk during the cycle, up to PCT starts