Before starting, make sure your sparkling water has chilled for a long time in the fridge (see above note).Wash all your fruit and chop the strawberries and remove stems. Add them along with all the remaining ingredients to a blender and blend until completely smooth. Taste and add any more sweetener if desired. I find this was plenty sweet with 4 heaping tablespoons, but if you are serving it at a party, you may add a little more.Lastly, drain the punch through a fine mesh strainer to catch any skins left behind from the grapes. See above photo in post. It does catch a lot. Pour in a pitcher and over ice if desired and serve. I garnished my glasses with extra fruit.