Yes, water stress -- big time, the because the roots haven't had enough time to grow into the surrounding soil.

Build a dike at the edge of the rootball, then fill the basin every day.

And, if possible, rig temporary shade.

Water slowly, and use your finger to check the depth of the moisture -- and it's going to require lots more water than you expect! Drip irrigation (even in the form of a tiny hole in a bucket's bottom) is far more effective than a sprinkler, which loses too much to evaporation. Poking along the dripline, you should be able to feel moist soil at least 3" deep the day following the watering. Also, a deep mulch will help prevent evaporation in those hot temperatures.

Link is to one sort of drip irrigator, especially handy if you don't like to poke holes in your buckets!

Here is a link that might be useful: LV's tree irrigator

No need to poke holes in buckets. Can make the same ssosrt of slow watering device with plastic jugs. Put two pinholes in the bottomwhere it turns upward, one on opposite corners.

Set the jugs on top of the original rootball. You need three 1-gallon jugs for a 15-gallon tree. Fill the jugs daily.

I am looking for ideas on how to protect some of my plants from the hot sun. I have heard about a special fabric that you can put over the plants on a temporary basis that will protect from the sun but still allow for air circulation. I can't get anymore info on it. Is it a myth?