is made with Peruvian quinine and Mexican agave, which adds a subtle sweetness, rather than the syrupy flavor that high fructose corn syrup-based tonics can, Q tonic gives the soda--and the liquor--equal billing. It's bitey, sharp and refreshing.
I sampled Q Tonic with different gins, and it makes a huge difference in my favorite cocktail. Granted, the price is steeper than Schwepp's or Canada Dry (it's sold in a 4 pack of single sized bottles for about $6), but it's definitely worth it.
Soon I'll post about 2 other tonic options...just in spring and summer--perfect G&T weather, in my opinion.
In the DC area, you can get Q Tonic at Dean and Deluca in Georgetown, and (soon) at MOM's Organic Markets.