First of all, how do you make Holy Water....you boil the hell out of it. Told to my friend by a priest so I guess it's an okay joke :-)
The following was shared by Sue Cifelli:
Holy water is a sacramental that remits venial sin. Because of the blessing attached to it, Holy Church strongly urges its use upon her children, especially when dangers threaten, such as fire, storms, sickness and other calamities. Every Catholic home should always have a supply of holy water in it.Source: Catholic Tradition
We do not take advantage of the benefits derived from holy water.
LET US CULTIVATE ITS USE
Untold spiritual wealth is concentrated in a tiny drop of blessed water.
And we give it so little thought!
If we would but realize now, as we shall realize after death, the many benefits which may be derived from holy water, we would use it far more frequently, and with greater faith and reverence. Holy water has its great power and efficacy from the prayers of the Church, which its Divine Founder always accepts with complacency.