I’ve never needed any until the very near future. I’ve read the sticky above on the subject, but this sticky/post is from the year 2012. Does anyone have a proven, safe (read: sterile) way of making bacteriostatic water?

Heres the basic idea from the sticky:

sterile vial
distilled water
1% BA
filter using .22 filter.

Is this the correct, proven way, or, is there a better way?