i'm just lurking a bit to see how this turns out for you mommas but I did want to add two things:
1. don't add honey to the culture-it has antibacterial properties and my source for yogurt starters recommends only adding honey at time of serving
2. my above mentioned source for yogurt starters is
Culturesforhealth.com. They have a huge variety of starters and loads and loads of awesome info!!!
ETA: I just went and check out Cultures for health and none of their starters are perpetuating in nondairy sources but if you can handle a small amount of dairy, you can keep a source culture.