Technically speaking, a priest or a deacon is only supposed to bless anything and certainly would be the only ones to use holy water in a formal blessing. However, informally we bless one another all the time. For instance, when someone sneezes the typical response is “God bless you.”
Many people have holy water fonts in their homes, usually on their doorframe. We all bless ourselves when we enter a church by dipping our fingers in the holy water font. Perhaps a good idea is for husbands and wives to dip their fingers in together at home or church and create a formal ritual that way.
Here’s one prayer for husbands to pray for their wives:
Lord, our God, bless _________ as my wife. Grant her the grace to persevere in Love for me. Help me to be the support she needs today and always, so that she may see your love for her through me. May I see her as you see her and may I look past her failings to see her as my partner and my loving spouse. May you be the foundation of our marital love, and may you strengthen our marriage to withstand all types of suffering. Grant that I may die to myself and my own needs and instead place my trust in you. Bless my wife and keep our marriage holy. Amen.