I think my ginger ale requests are now going to be phrased, "What kind of ginger ale do you have?" If they respond with a brand name, it seems more likely that they have real ginger ale.
Ginger ale and tonic water are my two main alternatives to Coca-Cola. Places that don't stock tonic try to get by with club soda sometimes, but that switch is just as obvious.
By the way, I note that a few places actually do make their own tonic water, among them Custom House, where I was surprised to see a bartender pour a brown liquid into a glass and then fill it up with club soda. I was prepared to remonstrate, but the taste was just right. When I got home, I did a little Googling on "homemade tonic water" and saw a variety of articles and blogs about making tonic from cinchona bark.
And I really recommend the house-made ginger ales served at Big Bowl, Ben Pao and Wow Bao. Ben Pao also does a frozen, vodka-laced ginger ale.
Custom House
www.customhouse.cc
500 S. Dearborn St., Chicago, 312/523-0200
Big Bowl
www.bigbowl.com
6 E. Cedar St., Chicago, 312/640-8888
60 E. Ohio St., Chicago, 312/951-1888
215 Parkway Drive, Lincolnshire, 847/808-8880
1950 E. Higgins Road, Schaumburg, 847/517-8881
Ben Pao
www.benpao.com
52 W. Illinois St., Chicago, 312/222-1888
Wow Bao
www.wowbao.com
845 N. Michigan Ave., Chicago, 312/642-5888
175 W. Jackson Blvd., Chicago, 312/334-6395
1 W. Wacker Drive, Chicago, 312/658-0305