Reference for Bava Batra 194:1

דאמר רבא סוחט אדם אשכול של ענבים ואומר עליו קידוש היום

[Moreover,] Raba said: A man may press out a cluster of grapes<span class="x" onmousemove="('comment',' And this certainly is not better than wine from the vat. ');">¹</span> and proclaim over it the <i>Kiddush</i> of the day!<span class="x" onmousemove="('comment',' This clearly shows that wine from the vat may be used for Kiddush, even at the start. ');">²</span>

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