I tried seven different flavors of Culture Pop probiotic soda.Ted BergI tried every flavor of Culture Pop probiotic soda I could find and ranked them from worst to best.I found a lot of the flavors tasted like a halfway point between regular soda and flavored seltzer.Of all the flavors I tried, the watermelon-and-lime Culture Pop was my favorite.Supermarket shelves across the United States are filling up with prebiotic and probiotic sodas that claim to be good for your gut.Popular brands like Poppi and Olipop say their sodas contain prebiotics designed to help good bacteria grow.