Related for Taanit 59:8
תניא אידך ערב תשעה באב לא יאכל אדם שני תבשילין לא יאכל בשר ולא ישתה יין דברי ר"מ וחכ"א ישנה וממעט בבשר וביין כיצד ממעט אם היה רגיל לאכול ליטרא בשר יאכל חצי ליטרא היה רגיל לשתות לוג יין ישתה חצי לוג יין ואם אינו רגיל כל עיקר אסור רשב"ג אומר אם היה רגיל לאכול צנון או מליח אחר סעודתו הרשות בידו
But the Sages say: He should make a difference [in his diet] and restrict his consumption of meat and wine. How should one restrict? If he was in the habit of eating one pound of meat he should eat one half only, if it is his usual practice to drink one log of wine he should drink one half log only; but if he is not in the habit of partaking any of these things he may not have these at all.
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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