For a yogurt alternative, try making a non-dairy pudding (Look it up online. The recipe should only take about 5 minutes). Cool it in fridge, then add a powdered probiotic, blend in about a 1/2 to 1 tsp per cooled pudding batch (or more if you find you like it that way). Mix in and let this set in the fridge a day or two. This can also increase its healthy acidophilus/healthy bacteria count even more and be so much more beneficial than any regular store bought yogurt anyway.
The great part about this pudding idea is you can add fruit purees to the vanilla pudding and make it like fruit-flavored yogurt. Be aware that some probiotics are not helpful as the cultures are dead (either not refrigerated or heated up while processed). Do your research before buying.