Didache

But concerning baptism, thus shall ye baptize. Having first recited all these things, baptize in the name of the Father and of the Son and of the Holy Spirit in living (running) water.

Περὶ δὲ τοῦ βαπτίσματος, οὕτω βαπτίσατε: ταῦτα πάντα προειπόντες, βαπτίσατε εἰς τὸ ὄνομα τοῦ πατρὸς καὶ τοῦ υἱοῦ καὶ τοῦ ἁγίου πνεύματος ἐν ὕδατι ζῶντι.

But if thou hast not living water, then baptize in other water; and if thou art not able in cold, then in warm.

ἐὰν δὲ μὴ ἔχῃς ὕδωρ ζῶν, εἰς ἄλλο ὕδωρ βάπτισον: εἰ δ̓ οὐ δύνασαι ἐν ψυχρῷ, ἐν θερμῷ.