Papias describes Wine being Grape Juice by stating that grapes when pressed give off wine:

"The days will come in which vines shall grow, having each ten thousand branches, and in each branch ten thousand twigs, and in each true twig ten thousand shoots, and in every one of the shoots ten thousand clusters, and on every one of the clusters ten thousand grapes, and every grape when pressed will give five-and-twenty metretes of wine. And when any one of the saints shall lay hold of a cluster, another shall cry out, 'I am a better cluster, take me; bless the Lord through me.' In like manner, [He said] that a grain of wheat would produce ten thousand ears, and that every ear would have ten thousand grains, and every grain would yield ten pounds of clear, pure, fine flour; and that apples, and seeds, and grass would produce in similar proportions; and that all animals, feeding then only on the productions of the earth, would become peaceable and harmonious, and be in perfect subjection to man."

Just like the Wine that was given to pharaoh when a servant came to press the grapes on his glass

No fermentation whatsoever, still called Wine in the Ancient World