Unless it was planted right in the root zone of a very thirsty tree, it should never need water everyday. It's entirely possible that you killed it with too much water. (Sorry to say.) Fertilizer when a plant is stressed is never a good idea either. If it's any comfort, I once killed a $125 Japanese maple that way. (Long term lesson, let me tell you.)

If I were you, I would back off the water pronto. Give it a good watering once a week if it doesn't get rain. Chances are very good that it's a goner, but there is a slight chance that it will make some new growth next spring. I wouldn't give up on it until then. Again, if you get rain, do NOT water more!