All you need is:
* tequila
* Crushed or cubed ice
* orange juice
* grapefruit juice
* fresh lime juice
* Squirt soda
*Lime or orange slices for garnish
* Fill one cantarito with crushed ice.
* Add a shot of tequila, then add half of the fresh juice mix.
* Lastly top with grapefruit soda next. Mix well to incorporate all flavors together.