Don't know if this will give you an idea of quantity but we had 6 tables of 10 people,
about 8 of the 60 were kids and we had about 5 drivers,
we had a bottle of red and one of white on each table also a jug of fresh orange for guests to help themselves, and asked guests to let the waitress know if they needed any more.
All the white went and the waitresses supplied about another 4 bottles and I would say out of the 6 red we had 2 of the bottles unused and the rest half full or less at then end,(i think my brothers took them to the evening room and finished them off !) We asked for waitresses to make sure everyone had some liquid in their glasses for the toast from the table wine or orange rather than have sparkling stuff which very few people like or drink, this worked out better than paying the drinks package which I was against because I didn't want the wine rationed.
I go to lots of weddings, and the thing I don't like is where you get one glass of wine and thats it , people then either ask for a refill and are refused or get drinks from the bar during the meal
If I was doing it again I would just have white on the tables and the waitress asking if anyone wants red, and just putting bottles where they are needed