We did a soda and water package for our brunch that worked out to be almost $900 for just 34 people. It was a HUGE waste of money, since two kinds of juice and coffee and tea were included in our brunch menu, and I now know we could have had a water station for about 25 bucks.
If I were to do it again, I might still offer the sodas but do it Billed On Consumption - there were so many leftover sodas at the end of our 3 hours.