1 1/2 oz of blended whiskey (or whiskey)
1 tsp of powdered sugar (or sugar)
1 tbsp of port
carbonated water (or sparkling water)
1/2 of msr tequila (or Agavero Tequila Liqueur)
1 of egg
Shake all ingredients (except carbonated water) with ice and strain into a highball glass over two ice cubes. Fill with carbonated water, stir, and serve.