We're offering coffee, hot and iced tea (both unsweetened), berry refresher (also unsweetened), mulled cider, and infused water, along with a selection of canned and bottled lemonade, sparkling water, sweetened tea, and maybe some sodas. I calculated that we will need 28 gallons total, not counting water. Will 5 gallons of water be enough for 140 guests, in addition to the other beverages? We're renting a canteen rather than offering bottled water, if that makes a difference.