A little gardening trick I learned from my mom is to make mini greenhouses for your individual plants if you had to transplant them in such a way that their roots are highly disturbed. For a few days after being transplanted, they will be very susceptible to getting dried out because the roots have not reestablished themselves. She always uses the top half of a two liter soda bottle because she can loosen the cap or take it off completely to adjust humidity inside.
She also does this for cuttings that she's trying to establish, and she often also fills the bottom half of the bottle with soil and slides it into the top half to make an entirely enclosed container.
Don't leave your plants in the direct sun if you do this though. They will probably get too hot.
These squash, which I transplanted yesterday, had their roots all tangled up together because they grew as volunteers from a rotting squash that I threw in the compost. To separate them from each other, I had to completely remove them from the soil they were growing in. They were fine overnight, but once it got hot today, they immediately wilted, even in the shade. They're looking a lot happier now they they're under their own little domes.