Spread the sugar on a small plate. Wet the rim of a lowball glass by dipping it into a bowl of water. Place the glass upside down on the plate with sugar, gently pressing the sugar onto the rim.
Fill the glass halfway with ice.
Combine tequila and lime juice ingredients with ice in a shaker and gently shake until very cold. Pour into glass and top with blood orange soda. Garnish with lime wheel or blood orange slice.