Using the same needle to pull bac water and add it to the peptide vial is fine, just wipe both tops first. Reusing that needle to draw the mix and then inject will leave it dull though, so grab a fresh syringe for pinning yourself. Clean the peptide vial before using the wipe on your skin too.
Can I use one needle to draw from the bac water vial and then add it to the peptide vial? For the actual shot into skin, do I switch needles or reuse the one from reconstitution?