Matsya Purana — The Ārdrānandakarī Tṛtīyā Vrata: Ritual Procedure
पिष्टोदकं तथा वारि कुष्ठचूर्णान्वितं पुनः उशीरसलिलं तद्वद् यवचूर्णोदकं पुनः //
piṣṭodakaṃ tathā vāri kuṣṭhacūrṇānvitaṃ punaḥ uśīrasalilaṃ tadvad yavacūrṇodakaṃ punaḥ //
Likewise, water mixed with paste (flour-water), and again water combined with powdered kuṣṭha; similarly, water infused with uśīra (vetiver); and again water mixed with barley-flour—these are the prescribed cleansing waters.
This verse does not discuss pralaya; it focuses on practical purification—specific kinds of prepared waters used for cleansing in ritual contexts.
It supports nitya-ācāra (daily discipline): a king or householder is expected to maintain ritual and bodily purity, using prescribed cleansing media before worship, vows, or sacred duties.
Ritually, it specifies cleansing waters (snāna/śauca) prepared with aromatic and purificatory substances (kuṣṭha, uśīra, barley flour), likely used before pūjā, vrata observances, or other rites requiring purity.