If these were planted in rows, I would drive a post at the end of each row and more posts about every 6 or 8 feet. Then I would take bailing twine, tie to one end post, and weave the twine from one post to the other until I reached the other end post. The corn plants can be pulled upright as I go. Short pieces of twine could be used to tie the long line to the middle posts.
If this is a bed of corn, I would set my posts around the outside of the bed and use the bailing twine first to encircle and then running across and even diagonal to hold the corn plants upright.
Providing a lot of soil moisture is always a good idea after there is any injury. However, corn often falls in winds once the soil is saturated. Better have supports in place first before turning on the water. The plants can grow out of the injury but without straightening first, they can also grow crooked and stay that way.
Hope that helps . . .
Steve