Cakradatta (Cikitsasangraha) 36.6

36.6

virikte ca yathādoṣaharaiḥ peyā śṛtā hitā .
vātodarī pibettakraṃ pippalīlavaṇānvitam .. 6 ..

And when he has been purged, thin gruel cooked with [drugs] that dispel the relevant doṣas is wholesome.
One suffering from vāta abdominal disease should drink buttermilk mixed with long pepper and salt; // 6