No. Rabies is destroying neurons, causing the symptoms. The hydrophobia is not literal fear of water (like phobias so often aren't) but a result of your brain being fried to the point where you have issues swallowing. If it were an issue of hydration, just IV fluids would be a given, and you would probably want IV access anyway.
Not a doctor or anything, though.
(OP originally asked for a way to cheat on an exam citing "personal reasons")