Charak Samhita
द्रवकार्येऽपि चानुक्ते सर्वत्र सलिलं स्मृतम्। यतश्च पादनिर्देशश्चतुर्भागस्ततश्च सः॥१००॥
Use the water in all formulations, where a particular liquid media is not specified. Wherever paada is mentioned, consider it as one fourth part.
english translation
dravakArye'pi cAnukte sarvatra salilaM smRtam। yatazca pAdanirdezazcaturbhAgastatazca saH॥100॥
hk transliteration by Sanscript