Consider the following premises. For all z, z will not read a book. For all z, z will drink water if and only if z will read a book. There is at least one z for which if z reads a book, then z is drinking water. Can we infer the following from them? For all z, z will drink water.
 From the fact that for all z, z will drink water if and only if z will read a book we can infer that for all z, if z drinks water, then z is reading a book. From the fact that there is at least one z for which if z reads a book, then z is drinking water, and that for all z, if z drinks water, then z is reading a book we can infer that there is at least one z for which z will read a book if and only if z will drink water. Finally, from the fact that there is at least one z for which z will read a book if and only if z will drink water, and that for all z, z will not read a book we can infer that there is at least one z for which z will not drink water, which contradicts that For all z, z will drink water. Therefore, the answer is no.