Related for Avodah Zarah 60:2
ת"ר יין תוסס אין בו משום גילוי וכמה תסיסתו ג' ימים השחלים אין בהם משום גילוי ובני גולה נהגו בהן איסור ולא אמרן אלא דלית בהו חלא אבל אית בהו חלא מיגרי בהו
Our Rabbis taught: Wine in the first stage of fermentation does not become prohibited by being left uncovered. And how long is it considered to be fermenting? Three days. Cress-dish does not become prohibited by being left uncovered. But those in the Diaspora have a custom to forbid it it [if left uncovered]. But this was said only if there was no vinegar in it; but if there is vinegar in it, it deters snakes.
Tosefta Terumot
It so happened that a dead snake was found in a wine cistern and they came and asked Rabbi Yehudah ben Bava, and he [ruled that] the cistern remained permissible [as the] wine was fermenting. As long as it is still fermenting, it is not subject to the prohibitions of exposed liquids (Sanh. 70a:10). And how long does it ferment? Three days.
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