Kombucha and drinks like kefir and buttermilk are rich in gut-healthy probiotics. Credit: pornchai sriprang / Getty Images Probiotic drinks like kombucha, milk kefir, water kefir, buttermilk, and probiotic juices can support digestive health. The amount of probiotics in these drinks can change depending on the ingredients, how long they ferment, how they are stored, and the type of bacteria or yeast used.