Some general tipping guidelines are to tip a server 15 to 20 percent for table service and to tip a bartender 15 to 20 percent of the tab. If a diner orders a single drink at the bar, a tip of $1 to $2 is acceptable.
When getting pizza delivered, it is appropriate to tip about 15 percent of the total bill, and a higher tip is appropriate if there is inclement weather. When dining at a large buffet, it is appropriate to tip the person who delivers drinks and checks in on the guest a couple of dollars. If ordering wine from a fine dining establishment, the sommelier should receive about 10 percent of the cost of each bottle.