Personally I only use Hospira BAC water since it's hospital grade — probably an unpopular opinion but I don't trust vendor BAC enough to risk it given what I've invested in the peptides themselves. For tirzepatide specifically I actually use Hospira's NaCl BAC, which is cheaper and easier to find, though from what I've heard it can damage reta and a lot of other peptides so I stick to tirz only with that. Sterile water works fine if you're doing a single-use vial where the whole thing gets used at once, and whatever you do, don't rely on AI for guidance on this stuff.
