Found a page on Wikipedia that had a ton of alcohol related proverbs/quotations, and take no shame in saying that there were quite a few I couldn't understand. At any rate, I did find two that seemed somewhat relevant:
酒の中に真あり "sake no naka ni makoto ari," which is the same as the latin, "in sake there is truth"
酒が沈むと言葉が浮かぶ "sake ga shizumu to kotoba ga ukabu" which means "when drink goes down, words come up."
It's something anyway. If you feel like suffering through some archaic language and kanji JWPce can't even find, knock yourself out: