A humid hide or shed box, as mentioned earlier is very easy to make.
Get a container with a lid, cut a hole either in the lid or side, put either damp, not drippy wet paper towel (several kind of scrunched up) in the container, add snake so they know what the hide is. This is the one I prefer, I have been told it has less chance of allowing mold to grow, not sure if that is true but I avoid risks to my snakes when ever possible. Also paper towel is so cheap and to put a few damp sheets of it in to a plastic container every month is nothing, I also feel I can control the amount of wetness in the shed box better with paper towel. Water temp that I use is slightly cool to my touch as that will be about the temp of the corn snakes skin.
OR
Get a container with a lid, cut a hole either in the lid or side, put damp, not drippy wet sphagnum moss, quite a lot of it(you want snakey to be able to crawl through it), in the container, add snake so they know what the hide is. Water temp that I use is slightly cool to my touch as that will be about the temp of the corn snakes skin.
If your snake feels they need the humidity, or likes the shed box you have created they will use it. I have two here who go in and do not come out for days(one was a problem shedder before I offered the box) and then shed perfect. I have another who comes and goes during her shed cycle and then sheds perfect(she was a problem shedder when I got her). The other three do fine on their own.
Using a shed box, if your snake likes it, avoids the whole mist tank daily which messes up the glass. As well it avoid other possible issues that can arise from daily misting. Such as; if over misted mold or bacteria can grow, if your substrate gets to damp then you have to change it all out and the extra work of having to mist daily. So I prefer to offer a shed box first and see of my snakes use them.
@Nroc for bathes or soaks I use my infared temp gun and make sure the water is not more than the 85 degrees their UTH is, this has never been a problem and the vet has told me that it is a safe temp for bathes.