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Thank you for your replies.

IIRC I've heard from Fr. Bitzer in one of his sermons that one should not bless oneself on the way out of Holy Mass. His reasoning was that every gesture in Church and during the Sacred Liturgy must be deliberate  and with a definite purpose. Since the purpose of blessing oneself is to purify oneself for Mass and the Mass itself should erase venial sins given the right dispositions, it doesn't make sense to bless oneself after Mass. Something along those lines.

About what Twice Dyed posted: Would throwing away the fountain water on Holy Friday also apply to the faithful's supply for private use?

.Below are a couple excerpts from the Ecclesiastical Dictionary 1900 Pg 709.

"The use of holy water is an act of piety instituted by the Church, common among the Faithfull, and employed in all religious ceremonies.  Holy water is used to drive away all that is evil and impure, and to draw down divine aid upon us, whether for the good of our soul or body."

""is beneficial to the bodies and souls of those who make use of it, and the banishment of what is foul and corrupt."

"We also know that holy water avails to procure the remission of sins, if those who employ it are rightly disposed.  It is a customary practice to make the sign of the cross with holy water on entering or quitting a church;  and at home in illness, temptation, or danger;  a practice we should ever keep up in a spirit of faith and penitence, that we may derive, there from, all the salutary effect it meant to produce"

Unfortunately, today we know more about what is happening in the world than we know about the customs of our faith.