Garudapurana 3.29.61

3.29.61

supānakasyaiva ca pānakāle samyak smarennārasiṃhākhyaviṣṇum /
gaṅgāmṛtasyaiva ca pānakāle gaṅgātātaṃ saṃsmaredviṣṇumeva //

At the time of drinking sweet beverages, one should properly remember Viṣṇu named Nārasiṃha; / and at the time of drinking the nectar of the Gaṅgā, one should remember Viṣṇu alone as the father of the Gaṅgā.