I'm not worried about @Braddsn. He's a resilient farm boy from Southern Illinois. It's going to take a lot more than alkaline BAC water to faze him.
I've been using Amazon purchased BAC as well. Same for some syringes and needles. I also make sure the reviews are many & solid on the purchased items and stick with the same seller & brand as previous purchases. No issues....yet.
FWIW, I did recently buy five bottles of BAC that appear to be Hospira brand for $25 from some lady I don't know on a Discord server I recently joined with a good bit of drama (not so sure about that decision now). Also, toyed with the idea of making BAC water and BAC saline water after reading some home brew posts on a Discord channel where people created "pony juice" as a cheaper Lipo-C type substitute from equine products. I still have a good bit of XCE sterile water vials on hand from previous buys (probably won't use, just can't bring myself to toss them). I can't see myself buying a case of Hospira from Medexsupply, but who knows, maybe I will at some point.
For now, I'll just use up what I have on hand and make a decision when I'm on my last bottles of water. I do have PH strips which I've used on new BAC water sources. All good so far. Honestly, I'm more worried about these sus peptide products from these inconsistent CN sellers that need "special water" to reconstitute.
We are all learning as we go. Some people are further down the road than others. Some people react differently to certain products as well. I'm all for learning from other peoples' lessons to avoid harm, but at the end of the day, we make our own decisions based on the information we have at the time.
