In addition to the New Testament references already cited, one might also consult the Septuagint, where οἶνος appears over 230 times.
καὶ ἔπιεν ἐκ τοῦ οἴνου καὶ ἐμεθύσθη καὶ ἐγυμνώθη ἐν τῷ οἴκῳ αὐτοῦ. καὶ εἶδεν Χαμ ὁ πατὴρ Χανααν τὴν γύμνωσιν τοῦ πατρὸς αὐτοῦ καὶ ἐξελθὼν ἀνήγγειλεν τοῖς δυσὶν ἀδελφοῖς αὐτοῦ ἔξω. καὶ λαβόντες Σημ καὶ Ιαφεθ τὸ ἱμάτιον ἐπέθεντο ἐπὶ τὰ δύο νῶτα αὐτῶν καὶ ἐπορεύθησαν ὀπισθοφανῶς καὶ συνεκάλυψαν τὴν γύμνωσιν τοῦ πατρὸς αὐτῶν, καὶ τὸ πρόσωπον αὐτῶν ὀπισθοφανές, καὶ τὴν γύμνωσιν τοῦ πατρὸς αὐτῶν οὐκ εἶδον. ἐξένηψεν δὲ Νωε ἀπὸ τοῦ οἴνου καὶ ἔγνω ὅσα ἐποίησεν αὐτῷ ὁ υἱὸς αὐτοῦ ὁ νεώτερος
And he drank of the wine, and was drunk, and was naked in his house. And Cham the father of Chanaan saw the nakedness of his father, and he went out and told his two brothers without. And Sem and Japheth having taken a garment, put it on both their backs and went backwards, and covered the nakedness of their father; and their face was backward, and they saw not the nakedness of their father. And Noe recovered from the wine, and knew all that his younger son had done to him (Genesis 9:21-24 LXX, Brenton translation)
I think one would have to concede that it is unlikely grape juice could have caused the behavior reported of Noah here.
καὶ ὃ μισεῖς, μηδενὶ ποιήσῃς. οἶνον εἰς μέθην μὴ πίῃς, καὶ μὴ πορευθήτω μετὰ σοῦ μέθη ἐν τῇ ὁδῷ σου.
Do that to no man which thou hatest: drink not wine to make thee drunken: neither let drunkenness go with thee in thy journey (Tobit 4:15)
μετὰ βουλῆς πάντα ποίει, μετὰ βουλῆς οἰνοπότει, οἱ δυνάσται θυμώδεις εἰσίν, οἶνον δὲ μὴ πινέτωσαν
Princes are prone to anger: let them then not drink wine (Proverbs 31:4)
ἀγαλλίαμα καρδίας καὶ εὐφροσύνη ψυχῆς οἶνος πινόμενος ἐν καιρῷ αὐτάρκης, πικρία ψυχῆς οἶνος πινόμενος πολὺς ἐν ἐρεθισμῷ καὶ ἀντιπτώματι.
Wine measurably drunk and in season bringeth gladness of the heart, and cheerfulness of the mind: but wine drunken with excess maketh bitterness of the mind, with brawling and quarrelling (Sirach 31:28-29)
The above are just a few examples of where I think one would be extremely hard pressed (forgive the pun) to interpret οἶνος as meaning "grape juice".