Mix a small amount of fabric softener with water in a spray bottle (like 1:10 ratio). You can watch the wrinkles fall out. Can toss it in the dryer for a minute if it’s too wet to wear, but you only need a tiny amount of the spray. It’s essentially the same as the wrinkle release spray downy makes but much cheaper since it’s just watered down fabric softener.

I wear 100% cotton dress shirts for work. They’re non iron but that’s not always perfect. I use a small amount of fabric softener mixed in a spray bottle with water (like 1:10 ratio, if even that much). I spray my shirts out of the dryer and can watch the wrinkles fall out in seconds. It only seems to work the best on cotton, athletic clothes don’t work as well.