Fill the glass to the top with ice. Also, add ½ cup of ice to the blender.
Use the jigger to measure 2 oz of tequila. Toss that into the blender.
Use the jigger to measure 1 oz of Triple sec. Toss that into the blender.
Use the jigger to measure 1 oz of lime juice. Toss that into the blender.
Use the jigger to measure .5 oz of simple syrup. Toss that into the blender.
Turn the blender on. Different blenders have different settings. A quick smoothie setting usually works if you have it. Otherwise, on hi for a minute or two should do it. You want the ice all crushed up.
Turn the blender off. Pour the drink into the glass.
Open the bottle of coronita.
Pour it into the glass and then leave the bottle turned upside down in the glass.