Holy water ... water that has been properly blessed by a priest ... is a sacramental that every Catholic should take advantage of. We bless ourselves with holy water as we enter or leave a church and we can do the same as we enter or leave our homes. We can also carry it with us. Holy water protects from demons. During exorcisms, it has been reported time and time again, that the possessing demons hate holy water. Any clean container can be used to hold such water and every church should make holy water available to the people. There is never a cost for obtaining the water.