I do about the same. I found a 20lb bag of potting soil I didnt even know I had it!!
I put a tray of moist (not soaking wet) soil in a tray a few inches deep and stick it in the cricket tub and put a piece of egg flat over it.
Make sure you have plenty of adult cricks in your tub.
I leave the dirt in there a week or so, then transfer it to it's own clean tub with egg flats and heating mat under it at about 80F.
Takes weeks for them to hatch, then feed them with cricket crack, gratted carrots, apple, etc.
I put wadded wet paper towels in for their water.
If they dont have food and esp. water, they will die very soon.