The Compendium of Caraka 6.16.107

6.16.107

drākṣāyāḥ pañca lākṣāyāḥ sapta droṇe jalasya tat/
sādhyaṃ pādāvaśeṣe tu pūtaśeṣe samāvapet//

five of grapes, and seven of lākṣā, in a droṇa of water:
that should be boiled down to a quarter, and into the strained residue one should throw