Pratah-krtya means
Sri Caitanya-caritamrta
CC Madhya-lila
The word prātaḥ-kṛtya in the present verse of the Caitanya-caritāmṛta means that one should evacuate regularly in the morning and then cleanse himself by taking a bath. One has to gargle (ācamana) and brush his teeth (danta-dhāvana). He should do this either with twigs or a toothbrush—whatever is available. This will purify the mouth. Then one should take his bath. Actually householders and vānaprasthas should bathe two times a day (prātar-madhyāhnayoḥ snānaṁ vānaprastha-gṛhasthayoḥ). A sannyāsī should bathe three times daily, and a brahmacārī may take only one bath a day. Whenever one is not able to bathe in water, he can bathe by chanting the Hare Kṛṣṇa mantra. One also has to perform his sandhyādi-vandana—that is, one has to chant his Gāyatrī mantra three times daily—morning, noon and evening.