*This holy water is not for drinking.
Take a glass of water, mix it with Salt, Rosemary, Sacred White Sage, St. John the Conqueror Root which must be torn to pieces in order to be used in the water, and visualize it illuminating with golden fire and do the sign of the cross 3 times on the glass. Then say
“St Michael the Archangel, defend us in battle. Be our defense against the wickedness and snares of the Devil. May God rebuke him, we humbly pray, and do thou, O’ Prince of the Heavenly host, by the power of God, cast into Hell Satan, and all the evil spirits, who prowl about the world seeking the ruin of souls, Amen.”
This water is used for driving evil spirits away, out of houses, or out of people. It is meant to burn them as if they were on fire. It brings them pain and weakens them. This blessing is designed to work on any evil spirit regardless of whether or not they are Demonic. Not all evil spirits are necessarily Demons, many are Ghosts who should be in Hell but managed to escape it.
You should also bring with you blessed salt. Salt wards off evil, blessing it makes it stronger. You can bless it using this same blessing. An evil spirit can not cross over or through salt. If you salt the outline of a room or the entrance of a door or a window they can not pass. Make sure to salt the outline of the room though.
Throwing salt on the floor without doing the outline just keeps them from walking on the floors. But they can still pass through the walls and walk on the ceilings. Be wary of them.
Salt will not ward something off unless it is evil. So the idea that it banishes all ghosts is a lie. I have proven that myself when I salted the floor of my room. Only the evil ghosts were barred from entering. If something has crossed a proper Salt line than it is not evil. That or it is an exceptionally powerful evil spirit but that is rare.