This site is a pretty handy way to calculate what you'll need for beverages for an event. I plugged in a 100-person meeting, 43 guys and 57 women for two hours with light snacks, and got back a detailed list of exactly what I'd need to keep everyone well-lubricated, including 13 bottles of red wine, 17 bottles of white wine, 69 bottles/cans/12 oz. servings of beer. But it also said I didn't need any soda or bottled water, and coffee/tea isn't mentioned. Still, it sounds like a good starting point.
Thanks to a MIMlister for the pointer.
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