I'm as far as you can get from an OT, but I do have a fair knowledge of microbes. I would really hesitate to say whether those lactobacilli are active. The fact that they're dehydrated makes me suspicious, but it would be hard to say without knowing what kind of tempuratures they've been exposed to.
Also, I can't think of any reason why you can't just throw the ACV right on in there with the yeast started FF.
Also, I can't think of any reason why you can't just throw the ACV right on in there with the yeast started FF.