Substitute tonic water for a calorie-free mixer like club soda or seltzer. You'll get that same bubbly feel and gin taste without the added calories. Add a splash of lime or lemon for extra flavor.
On its own, seltzer does not have minerals and is naturally sugar- and calorie-free. However, many seltzer water brands do have added flavorings or sweeteners, such as natural fruit essences ...
but I think seltzer water tastes a little more natural and pure. There are lots of different ways you can flavor your vodka seltzers, depending on what you have on hand at home. Here are some ideas: ...
If spiked seltzers become more popular, it will likely be for the same reason that LaCroix's sales jumped - carbonated water is viewed as a low-calorie alternative to soda, so spiked versions ...