The Compendium of Caraka 8.3.12

8.3.12

bsteralābhe plavajo galo vā syādaṅkapādaḥ sughanaḥ paṭo vā/
āsthāpanārhaṃ puruṣaṃ vidhijñaḥ samīkṣya puṇye 'ahani śuklapakṣe//

In the absence of a bladder, the neck-skin of a swimming bird, or a spotted deer's foot, or a very dense cloth may be used.
Having examined a person fit for a non-unctuous enema, the expert in procedure, on an auspicious day in the bright fortnight,