A common tradition for the feast day of the Epiphany is to bless your house with Epiphany water. Below is a short rite of blessing for the Epiphany from the ever helpful and informative Fisheaters website:
At today's Mass, there will be a blessing of gold, frankincense, myrrh, Epiphany Water, and, after Communion, a blessing of chalk. Bring small special items of gold to have with you during the Mass, and they will be blessed if they are exposed as you sit in your pew with them (wedding rings, rosaries, an heirloom piece of gold jewelry, for example).
When Mass is over, you will take some of the blessed chalk, frankincense, myrrh, and Epiphany Water home with you, so it's good to bring a container to transport Holy Water and one to put some grains of incense and a piece of chalk into. (Note: if you can, take and keep 5 pieces of blessed incense for your Paschal Candle this Easter.)
When you get home, sprinkle some Epiphany water (otherwise and afterwards used as regular Holy Water) in the rooms of your house to protect it and bring blessings. This Holy Water recalls the waters of the Jordan, and is a visible reminder of Christ's Divinity, of Jesus' revealing Himself as God at His Baptism, when were heard the words from the Father: "This is My beloved Son, in Whom I am well pleased." This rite of blessing the home -- led by a priest, if possible, or the father of the house if no priest is available -- goes like this:
Upon entering the house:
Priest/Father: Peace be to this house.
All:And to all who dwell herein.
Priest:From the east came the Magi to Bethlehem to adore the Lord; and opening their treasures they offered precious gifts: gold for the great King, incense for the true God, and myrrh in symbol of His burial.
During the Magnificat, the room is sprinkled with holy water and incensed.
All:My soul doth magnify the Lord, and my spirit hath rejoiced in God my Savior. For He hath regarded the humility of His handmaiden. For behold, from henceforth all generations shall call me blessed. For He that is mighty hath done great things to me, and holy is His Name. And His Mercy is from generation unto generations upon them that fear Him. He hath shewed might in His arm, He hath scattered the proud in the conceit of their heart. He hath put down the mighty from their seat, and hath exalted the humble. He hath filled the hungry with good things, and the rich He hath sent empty away. He hath received Israel, His servant, being mindful of His mercy. As He spoke to our Fathers, Abraham and His seed forever.
After this is completed:
All: From the east came the Magi to Bethlehem to adore the Lord; and opening their treasures they offered precious gifts: gold for the great King, incense for the true God, and myrrh in symbol of His burial.
Priest: Our Father Who art in Heaven, hallowed be Thy Name. Thy Kingdom come, Thy will be done on earth as it is in Heaven. Give us this day our daily bread, and forgive us our trespasses as we forgive those who trespass against us. And lead and lead us not into temptation.
All: But deliver us from evil.
Priest: All they from Saba shall come
All: Bringing gold and frankincense.
Priest: O Lord, hear my prayer.
All: And let my cry come unto Thee.
Priest: Let us pray. O God, who by the guidance of a star didst on this day manifest Thine only-begotten Son to the Gentiles, mercifully grant that we who know Thee by faith may also attain the vision of Thy glorious majesty. Through Christ our Lord.
Priest: Be enlightened, be enlightened, O Jerusalem, for thy light is come, and the glory of the Lord is risen upon thee-- Jesus Christ born of the Virgin Mary.
All: And the Gentiles shall walk in thy light and kings in the splendor of thy rising, and the glory of the Lord has risen upon thee.
Priest: Let us pray. Bless, O Lord God almighty, this home, that in it there may be health, purity, the strength of victory, humility, goodness and mercy, the fulfillment of Thy law, the thanksgiving to God the Father and to the Son and to the Holy Spirit. And may this blessing remain upon this home and upon all who dwell herein. Through Christ our Lord.
After the prayers of the blessing are recited, walk through the house and bless each room by sprinkling with Epiphany water and incensing it. Take the blessed chalk and first write the initials of the three Wise Men, connected with Crosses, over the inside of your front door (on the lintel, if possible). Then write the year, breaking up the numbers and the year so that they fall on both sides of the initials. It should look like this, for ex.:
20 C+M+B 13
with the "20 "being the millennium and century, the "C" standing for the first Wise Man, Caspar, the "M" standing for Melchior, the "B" standing for Balthasar, and the "12" standing for the decade and year. It is also popularly believed that the Kings' initials also stand for "Christus mansionem benedicat" ("Christ bless this house").
Fisheaters offers this in downloadable form here.