Patra

Patra

पात्र, pātra

It is a vessel for water. Water is often used in various rituals (homa, puja, etc.) as an offering to Deities or for the sprinkling of a sadhaka and items of sadhana.

There is one of the common mantras for water:

jala gāyatrī matra 

sat namo ādeś | gurujī ko ādeś | oṁ gurujī |
jal manjan jal devatā guru manjan guru jñān |
hāth manjan dhartrī alaṣ puruṣ kā dhyān |
pānī pānī mahāpānī sotī kāyā amar kar jānī | ure na haṁsa bikhare na kāyā śiva śakti ne dhyān agāyā |
oṁ alīl ādi alīl alīl puruṣ kī mātā kvārī pitā yatī nityayogī dhare dhīr nirog ho kāyā vajr ho śarīr |
jhare pārā pīve yogī ure kāyā | alakh niranjan terī māyā |
jal bimbāya vidmeh nīl puruṣāya dhīmahī tanno alīl pracodayāt |
itanā jal gāyatrī jāp sampūrṇa | śrī nāthajī gurujī ādeś | ādeś | 

Adesh to the Holy Name! Adesh to Guruji! Om Guruji! The ablution by water, by divine water is the ablution by knowledge of Guru. Do dhyana to gain immortality, sprinkling unmoved ground. Water, water, the great water is the source of the body. When the mind directed to Shiva and Shakti, Hamsa the swan doesn’t  fly away, the body doesn’t disintegrate. Om water, the elemental water that is immaculate mother and father-hermit of man, of the ageless yogin whose body is healthy and strong. The yogin’s body evaporates like the dropping mercury due to his adherence to Alakh Niranjan. Let me comprehend the Spirit of Universe, while I’m meditating to the reflection in this blue water. This way Jala-gayatri is completed. Shri Nathaji Guruji adesh! Adesh!

The mantra from the book of Yogi Vilasnath "Shri Natha Rahasya"