Consider the following premises. For all x, x will drink water or x will not take a plane. For all x, x is an astronaut or x will take a plane. For all x, if x works, then x is drinking water. For all x, if x drinks water, then x is working. There is at least one x for which x is not an astronaut or x will work. Can we infer the following from them? There is at least one x for which x will drink water.
 From the fact that for all x, if x works, then x is drinking water, and that for all x, if x drinks water, then x is working we can infer that for all x, x will work if and only if x will drink water. From the fact that for all x, x will drink water or x will not take a plane we can infer that for all x, if x takes a plane, then x is drinking water. From the fact that for all x, x is an astronaut or x will take a plane, and that there is at least one x for which x is not an astronaut or x will work we can infer that there is at least one x for which x will take a plane or x will work. From the fact that for all x, x will work if and only if x will drink water we can infer that for all x, if x works, then x is drinking water. Finally, from the fact that for all x, if x takes a plane, then x is drinking water, that for all x, if x works, then x is drinking water, and that there is at least one x for which x will take a plane or x will work we can infer that there is at least one x for which x will drink water. Therefore, the answer is yes.