Well, right now they can have neither, because they're on a medical formula diet. But hopefully in another month or two they can start having real foods back, including our milk substitutes of choice,
almond milk and coconut milk, both of which you can make yogurt out of. I'm also curious about hemp milk, but we haven't tried it. A yogurt maker is almost certainly in our future, but I don't really like yogurt myself, so I keep putting it off for now.