Transplanted oak tree is wilting - can it be saved?

An oak tree sprouted up in my flower bed a few years ago and grew to be about 7 feet tall. Last month, my husband decided to move it and got a friend to help. I was not home when they dug it up but I am sure they damaged the roots and did not properly prepare the new hole. The only thing he's done right is giving it a lot of water. Now the ends of the branches are curling and the edges of the leaves are browning. I'm concerned the tree is dying. I don't know what type of oak it is, but I live in the southwestern part of New York State, if that helps.