How do you revive a young red oak tree that was deprived of light and water past several days of needing care?

I went out of town for a week, leaving my roommate in charge of watering my tree that's just a couple of months old, as well as cracking the blinds for sunlight. Normally I would water it 3/4 cup every 3 days, and open the blinds in the morning until the sun fell. Unfortunately when I got home, my baby tree has wilted to the point of, well I'm not sure of its this bad but, the point of no return. Some one please tell me how to being this baby red oak tree back to full health?