Offering water to Sun is performed by millions of Hindus every day morning. Sun is pratyaksha Brahman or the visible god in Hinduism. The mantra that is chanted while offering water to the sun is the Gayatri Mantra.
Water Offering Mantra
ऊं भूर्भुव: स्व:
तत्सवितुर्वरेण्यं
भर्गो देवस्य धीमहि
धियो यो न: प्रचोदयात्
Om Bhuur Bhuvah Svah
Tat Savitur Varennyam |
Bhargo Devasya Dhiimahi
Dhiyo Yo Nah Pracodayaat ||
How to Chant the Mantra While Offering Water to Sun?
Wake before sunrise and take bath. Put some black til (sesame) in the water.
Wear white, orange or ochre color dress and go to a spot from where the rising sun is visible.
Chant the mantra by looking at the sun and pour the water on earth.
You can chant the mantra one time or seven times.