Swap out Tonic for Diet Tonic
Each serving of Tonic Water has 90 calories. Add the additional 100 calories each shot of tequila has, and you might as well have ordered a margarita. Swap out the Tonic for Diet Tonic. All the flavor without the calories. (Or just go with Seltzer water a.k.a. ZERO calories.)
[Photo via @doscaminos]