Combine raspberries, cranberry juice, and sugar in a blender.
Blend until smooth.
Pour mixture through a sieve to remove any seeds.
Add 1/4 cup of blended fruit puree to a glass.
Fill glass with 1 can of lime sparkling water.
Garnish with lime wedges or slices as desired.
Notes
I used sparkling water flavored with lime to add a crisp, clean flavor to the drink. You could use regular sparkling water and squeeze in the juice of 1/2 a lime into each 12 oz serving.