Consider the following premises. For all y, if y were happy, then y is drinking water. For all y, if y drinks water, then y is happy. There is at least one y for which if y were happy, then y is drinking water. Can we infer the following from them? If we can, name the inference rule being used: For all y, if is not true that y will drink water if and only if y is happy.
That contradicts the premises. Therefore the answer is no.