BAC in Sweden/The Nordics

How long would this last after combining it similarly inside those vacant sterile containers?

If you practice good aseptic or sterile technique with a clean work surface and so on then a freshly made vial will last for a couple of years. Once you start using one with needles aim for somewhere between 28 days and 56 days. Watch for cloudiness or anything floating inside; that's when you should throw it out.

I prepare a ten percent BA stock solution in sterile water. Then I add one millilitre of that stock to ten millilitres of sterile water to reach roughly zero point nine one percent. This works with standard sterile water ampules and creates less waste. We just need to stay between zero point eight and one point five percent anyway.

Didn't you mean zero point one millilitre to ten millilitres instead? I considered the smaller plastic vials but it seemed like more hassle with tinier measurements and extra supplies. For me it's one larger vial, one small syringe and an alcohol swab and I'm done for over a month. Glass vials would be nicer to reduce waste.

Preparing a ten percent stock: remove one millilitre of sterile water from a ten millilitre vial then add one millilitre of USP BA to the remaining nine millilitres. That gives ten millilitres of ten percent stock. To make the working solution add one millilitre of the stock to a sterile vial and then add ten millilitres of water. Label everything clearly.

That's due to the salt inside, which explains why I steer clear of blending the compound together with salt.

It's not the regular version which contains benzyl alcohol. The product sold right now is a different one that contains sodium chloride instead, which should not be mixed with that peptide.