Shiva Purana
नद्यस्समुद्रगामिन्या नटाद्वाम्भः समाहृतम् ॥ शीतञ्च वस्त्रपूतं तद्विशिष्टं स्नानपानयोः ॥ २७ ॥
Water taken from an east-flowing or west-flowing river is excellent for bath and drink. It shall be cool and filtered with a cloth.
english translation
nadyassamudragAminyA naTAdvAmbhaH samAhRtam ॥ zItaJca vastrapUtaM tadviziSTaM snAnapAnayoH ॥ 27 ॥
hk transliteration by Sanscript