Hmm...some sort of beverage, maybe? I was thinking orange juice.

And yeah, the thrush thing is kind of bizarre since yogurt's supposed to help! Though the sugar might be something it's feeding on. I know when I had it, I was told to eat plain yogurt and cheese as sources of dairy, but I'd cheat with a little bit of frozen yogurt here and there.

Something you'll want to do (speaking from own experience with self-and-baby nearly four years ago) is make sure you sterilize your dishes/silverware/etc.