Here is a way you can make your own Fresca using Sodastream's diet grapefruit mix.
Equipment
Sodastream (optional)
Ingredients
12ozCarbonated waterCanned, botted or using Sodastream
15-20mlSodastream pink grapefruit syrupAdjust to your taste
Instructions
Add syrup to carbonated water.
Enjoy!
Notes
This is not really a recipe, but a simple way to enjoy Sodastream's pink grapefruit sugar-free syrup even if you don't have their carbonating kit. Simply add 15-20ml of the syrup to 12oz of carbonated water. You can get the syrup on Amazon for about $5, which makes enough for 25 - 12 oz servings.