Ingredients:
1 shot tequila
1 shot lime juice
1 1/2 teaspoon Splenda
8 ounces unsweetened orange-flavored sparkling water

Method - The Procedure
Put the tequila, lime juice and Splenda in the bottom of a tall glass and stir. Fill with ice and pour in orange-flavored sparkling water to fill.

4 grams of carbohydrate, a trace of fiber, a trace of protein, and 76 calories.

From: 500 Low-Carb Recipes

This recipe from CDKitchen for Margarita Fizz serves/makes 1