What is your favorite beverage to make in your *at home soda maker*?

I own a popular at home soda maker. I dare not mention the brand.

I think the zero calorie grapefruit soda is my favorite. Runners up are diet Pepsi, zero calorie strawberry watermelon and diet tonic.

You?
What is your favorite beverage to make in your *at home soda maker*?
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