The Compendium of Bheḷa 6.1.24

6.1.24

kāmaṃtu tiktakaissiddhaṃ hitaṃ kvathitaśītalam | teṣāṃsāmiśṛtaṃ pānaṃye cāpy ekāntaśītalāḥ ||

However, [water] prepared with bitter herbs and cooled after boiling is beneficial at will; / for them, a mixed drink [is suitable], as well as for those who are extremely cold.