All ingredients ready? Let's begin!
In a small pot over high heat, add the water and sugar.
Stir and mix constantly until the sugar has completely dissolved (this may happen before it even reaches a boil).
Remove the pot from heat and allow to cool to room temperature. You can speed up this process by transferring the sugar water to a safe container and putting it in the fridge.
Once the sugar water has cooled to room temperature or colder, transfer it to a glass jar or other airtight container and add the lemon juice and lime juice.
Make sure the lid is on properly and shake to incorporate the juice and sugar water. Place in the fridge until needed.
To assemble the shots, first mix together the sugar and food dye until the sugar has been colored a pleasant pink shade.
Put the colored sugar on a small plate and set aside.
In a cocktail shaker, add a few ice cubes along with the vodka, watermelon sourz, and lemon-lime mix. Place the lid firmly on and shake vigorously for a minute to mix.
Dip the rims of your shot glasses in the lemon-lime mix then into the dyed sugar to coat the edges.
Pour the liquor from the cocktail mixer into the shot glasses (trying not to ruin the sugar).
Stick an unwrapped pink starburst on the rim, serve, and enjoy!