OK, assembling the attempted hints given

:
In order to transform your hardware store acid into something usable, you will need to construct an assemblage of flasks and tubes (preferably Drechsler gas washing bottles), and an air pump, such that you can bubble air into gently warmed, store-bought acid and then lead the fumes through an outlet tube in order to bubble them through distilled water contained in second vessel. Done correctly, this will provide you with HCl to a maximum concentration of about 20%, and free from metals contamination.
It seems you're sufficiently aware of the requisite safety procedures (I hope!)
“There is a way of manipulating matter and energy so as to produce what modern scientists call 'a field of force'. The field acts on the observer and puts him in a privileged position vis-à-vis the universe. From this position he has access to the realities which are ordinarily hidden from us by time and space, matter and energy. This is what we call the Great Work."
― Jacques Bergier, quoting Fulcanelli