NOTHING in scripture says anything about using salt to make holy oil. nor does it say ritualistic prayer creates it. in fact this is what is said:
Mar 6:12 And they went out, and preached that men should repent.
Mar 6:13 And they cast out many devils, and anointed with oil many that were sick, and healed them.
Jas 5:14 Is any sick among you? let him call for the elders of the church; and let them pray over him, anointing him with oil in the name of the Lord:
Jas 5:15 And the prayer of faith shall save the sick, and the Lord shall raise him up; and if he have committed sins, they shall be forgiven him.
Jas 5:16 Confess your faults one to another, and pray one for another, that ye may be healed. The effectual fervent prayer of a righteous man availeth much.
so basically the creation of holy oil is through a prayer of faith, used for healing purposes.