This homemade cranberry lemon lime soda is a sweet-tart soda inspired by Sprite Cranberry and the popular Poppi Cranberry Fizz Soda. Make it with either sugar or stevia!
Zest and juice the lemon and lime directly into a small pot. Add the cranberries, stevia (if using), sugar, and water to the pot. Bring to a simmer, stirring occasionally, then cook at a simmer for 10 minutes.
Remove from the heat, stir in the citric acid (if using), and let cool 30 minutes.
Strain the mixture and bottle.
For soda, pour 1-2 ounces of the cranberry syrup over ice and top with sparkling water.