Get your glasses ready first by running a lime wedge through the rim and dipping it in salt. Set aside.
Add all ingredients to a blender. Blend until slushy in consistency, adding more ice as necessary and sweetener to taste.
Notes
*If using a powdered sweetener it's always best to dissolve them in a little hot water prior to avoid any grittiness. You can use anything from allulose, Lakanto (or other erythritol sweeteners) or xylitol. And if paleo, feel free to use maple syrup. Please note that nutrition facts were estimated without the booze (so you add to your liking, or even do without!). And all the carbs are derived from the lime juice, so you can significantly lower them by simply using less (even 1/3 cup will do the trick). Though also keep in mind that limes are highly nutritious (think the obvious vitamin C, but also rich in cancer-fighting compounds called flavonoids).