Each of the following meditations can be done, in turn, before the traditional three immersions in the ritual bath.

Letting Go of the Past (Gently)

Take a deep, slow breath. Feel the water around you. Let it wash and cleanse every part of you. . . . Let the tender waves of the mikvah carry off your hurts, cleanse your sore spots. Think of the things in the past — finished relationships, negative behaviors, violations and losses. Let this womb hold you. Feel its strength and purity. Let it wash away the pain and sadness. Allow yourself a moment of parting from these things. It is time to say goodbye to these parts of your past. Watch them float away. Feel the warm water surround you, comfort you, bathe you. This is the womb of humanity. Let it rebirth you.
Immerse.
Recite the blessing for immersion

Baruch atah Adonai Elohenu Melech ha olam, asher kideshanu b'mitzvotav vetzianu al ha Tvilah.

Blessed Are You Source of Life who sanctifies us with Your Mitzvot and commands us concerning immersion.

Feeling the Present (Keep It Slow)

Breathe. Feel the sense of your own well-being. Where are you at this moment? Feel your body. . . . your toes, your legs, your buttocks, your genitals, your belly. Feel the water soothe your back; feel the wetness on your shoulders, your neck, and your face, in your hair. Feel this moment. Feel the life force in your body. Float in the warm liquid, in the sacredness of this event. Feel the mayiym hayyim (living waters) merge with you, Feel your connection to this place, to this moment, to the Jewish people (if you are Jewish), to humanity, the universe, and eternity.
Immerse.
Say the following prayer:

Shema yisra'el adonai eoloheinu adonai ehad.

Hear O Isreal, Adonai Our God, Adonai is one.

Welcoming the Future (Slowly, Slowly)

Stretch your body. Breathe. Think of your future. Let the water's spiritual tide bring your desire. What do you want as a person? Feel the water wash you with love, with contentment, with the joy of life, with the presence of God. Imagine all the possibilities that await you. Envision yourself celebrating your new identity. Bathe yourself in the promise of fulfillment that your choices will bring.
Immerse.
Say the Shehechiyanu

Baruch atah Adonai Elohenu Melech ha olam, shehechiyanu vekiyyemanu vehiggi'anu lazeman hazeh.

Blessed Are You Source of Life, who has kept us alive and sustained us and enabled us to reach this time.

— from Meditations for the Mikvah by Jane Litman

Nadine Epstein, Rosita Arvigo in Spiritual Bathing