If you want to make the base with white grape juice, like Starbucks does, I recommend following the process I use in my Strawberry Acai Refresher recipe. Make the base with 2 ¼ cups white grape ...

First introduced in 2012, Starbucks Refreshers are a reason for many customers to make their way to Starbucks ... The drink combines a sweet strawberry-açaí base with green coffee flavor ...