Tequila Old-Fashioned

1 1/2 oz Tequila
1 splash Carbonated water
1/2 tsp Sugar
1 dash Bitters
1 stick Pineapple

Mix sugar, bitters, and 1 tsp. water in an old-fashioned glass. Add tequila, ice cubes, and carbonated water. Add the stick of pineapple and serve.