Consider the following premises. Joseph is drinking water if and only if it is raining. If Joseph drinks water, then it is raining. It is not raining. Can we infer the following from them? Joseph is drinking water.
 From the fact that Joseph is drinking water if and only if it is raining we can infer that if it rains, then Joseph is drinking water. From the fact that if it rains, then Joseph is drinking water, and that if Joseph drinks water, then it is raining we can infer that it is raining if and only if Joseph is drinking water. Finally, from the fact that it is raining if and only if Joseph is drinking water, and that it is not raining we can infer that Joseph is not drinking water, which contradicts that Joseph is drinking water. Therefore, the answer is no.