Here are two ways to make your low carb skinny margarita. For more tart & less carbs, you can leave out the "optional" ingredients.
Cut lime in to wedges and muddle in a glass. Top with tequila & club soda. If you want to add sweetness you can include your choice of low or no carb sweetner such as stevia or sucralose to taste (see package for carb content). If you are not watching your carbs too closely, you can add a splash of Triple Sec (will increase recipe by 10 calories and 1 1/2 more carbs)
Total Calories 104 (115 with Triple Sec)
Total Carbs 2 (3.5 with Triple Sec)