Where is everyone getting acetic acid?

[Bflo_Bflo_Bflo_Bfl]

So I’m looking at the fibrils threads and I’m wondering - where are you getting acetic acid and what type are you using? Left to my own devices I’d inject distilled white vinegar into a vial of BAC, bit by bit, and test pH as I went along.

Is there a better source of acetic acid / a better way to do this? I’m honestly not too concerned,but if it’s easy enough to get a low pH reconstitution solution I might as well err on the side of caution.