Popwell

The best spec sheet on the page: 1 gram of sugar or less and around 6 grams of fiber, about a fifth of your daily value — among the highest fiber counts in this category. Made by Talking Rain, the company behind Sparkling Ice, Popwell keeps sugar low without relying on cane sugar. It is also the only brand here offering caffeine: Orange Cream, Classic Cola and Cream Soda each carry 40mg from green tea extract, within an eight-flavor lineup that also runs Cherry Citrus, Blackberry Lime, Tropical Mango, Root Beer and Ginger Pop. Reception from critics has been more mixed than the spec sheet suggests. Buy it if minimum sugar and maximum fiber are the priority, and start with the cream flavors.