1 oz of Brandy
1/2 oz of Light Rum
1/2 oz of bourbon whiskey
1 tbsp of powdered sugar (or sugar)
carbonated water (or sparkling water)
1/2 of msr tequila (or Agavero Tequila Liqueur)
Shake all ingredients (except carbonated water) with ice and strain into a collins glass over ice cubes. Fill with carbonated water, stir, and serve.