Be patient. It will take more than 4 days for their feeder roots to settle in and be able to absorb water and nutrients from the soil. In the meantime, be careful not to overwater them. Until the feeder roots are established, the plants can't pull water from the soil. That leaves the soil too wet and the large roots can develop root rot. Just keep the soil evenly moist.
If possible, it might be good to cover the plants with clear plastic for a few hours during the heat of the day, to keep the humidity high. That can help reduce the wilting. If you do that, though, don't leave it on all the time or for too many days, because molds can grow and attack the plants. Try to devise a way to cover them and still allow open space for ventilation. In other words, don't put the plastic down tight to the surface of the soil ... if that makes sense.
"Isn't it enough to see that a garden is beautiful without having to believe that there are fairies at the bottom of it too?" - Douglas Adams