I am aware of Nephilim-Wine connection, but it is a bit tenuous. You need to put a couple of sources together:
1) The bible talks about a King
Og who, according to some traditions was actually around during the time of the Flood (he hung on to the outside of the Ark, as he was so big).
"As the floodwaters swelled, Og, king of Bashan, sat himself on one of the rungs of the ark's ladders and swore to Noah and to his sons that he would be their slave forever. What did Noah do? He punched a hole in the ark, and through it he handed out food to Og every day. Og's survival is hinted at in the verse 'Only Og remained of the remnant of the Rephaim' (Deut 3:11)." (From Pirkei D'Rebbe Eliezer 23 as quoted in The Book of Legends edited by Hayim Nahman Bialik.)
Note: The text quoted is from around ~400 CE.
2) Og is known as one of the
"Refaim", a race of giants who lived in ancient times.
3) "Refaim" and "Nephilim" are sometimes used to describe the same people in the various legends. See
here for an initial look. Some say the "Refaim" were a subset of the "Nephilim" - who lived in a certain area (of which Og was one).
4) Among other things, Noah is known to be the first person to ever get drunk (see:
Genesis 9:20)
5) While most Jewish sources blame Noah's drunkenness on Satan somehow, there is a tradition that it was Og who somehow altered the wine to induce drunkenness (presumably until this point it was merely just a way of getting closer to god). An example of that is
here"I am giving thy descendants two extra blessings," said Og, chuckling.
He rolled over and over on the ground in great glee and then said:
"When a man shall drink too much of the juice of the wine, then shall he become a beast like the pig, and if then he still continues to drink, he shall behave foolishly like a monkey."
And that is why, unto this day, too much wine makes a man silly.
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So:
Grigori --> Nephilim --> Rephaim --> King Og --> Noah --> wine.
Yes, it's a little involved, but there *is* a connection. It would not surprise me to see other traditions where Grigori (or at least Nephilim) are somehow connected to wine/strong drink. It was after all one of the traditional way of worshiping "powers".