Somewhere in most Indian homes there is a small sealed bottle of Ganga jal, brought back from a pilgrimage, kept for pujas and for the last moments of life.
In chapter ten, Kṛṣṇa names what he is. At 10.31: of moving things I am the wind, of those who bear weapons I am Rāma, and of rivers I am the Ganga, jāhnavī.
The river you keep at home is in the Gītā, in Kṛṣṇa’s own list of himself.
A few drops at every puja. A verse in every home.
Going deeper
Chapter 10 holds the long list in which Kṛṣṇa names what he is. It begins at 10.19, where he says he will speak of his most prominent glories, because there is no end to them. 10.31 is one line of that list: of moving things he is the wind, of those who bear weapons he is Rāma, of water creatures he is Makara, and of rivers he is the Ganga. The verse before it, 10.30, names Prahlāda among the Daityas and the lion among beasts. The verse after, 10.32, turns from rivers to beginnings, middles and ends. The Sanskrit calls the river jāhnavī. The point of the list is not geography. In each pair, the best example of a thing is where you can look and see him. A river kept in a bottle at home is one of those places. Read the whole chapter at chapter 10.