By must, I am guessing you mean that it still has grape skins, seeds, etc. and hasn't been pressed, yet. If that is the case you probably have enough. If it has been pressed already, you probably need another packages.
Side Note: It will be interesting to hear of your experience with the Wyeast Liquid Malo. I haven't heard of many folks using it more than once. It might be great and people just don't talk about it.