karśanaṁ tapa āsthitaḥ

tatra-there; candra-vasa-the Candravasa River; nama-named; tamraparni-the Tamraparni River; vatodaka-the Vatodaka River; tat-of those rivers; punya-pious; salilaih-with the waters; nityam-daily; ubhayatra-in both ways; atmanah-of himself; mrjan-washing; kanda-bulbs; astibhih-and by seeds; mula-roots; phalaih-and by fruits; puspa-flowers; parnaih-and by leaves; trna-grass; udakaih-and by water; vartamanah-subsisting; sanaih-gradually; gatra-his body; karsanam-rendering thin; tapah-austerity; asthitah-he underwent.