Antifreezes? There are a heap of them out there.
I try and save dry dirt. If I can locate enough of it, I will mix rotted wood (as from under old, downed trees) with my dirt. I like rotted dirt particularly for bobcat sets.
I have tried mixing various things with dry dirt, and have been generally dis-satiisfied.
Dry out some peat moss, and mix just enough to make it pack.
Like all of us, I have scrounged dirt at the set site.
In recent years I have used a 50/50 mix of proplyene glycol and water, as a spray. I layer thr dirt with the spray.
For those of you worried about any smell PG may leave, I guarantee that you will have less dig-outs using PC that you will using any salt-based antifreeze mixed with your dry dirt. Perhaps you do not have the deer that we have, but large numbers of deer i an area will guarantee dig-outs if you use any salt based antifreeze.
For the past three years I have been weaning myself to waxed dirt, and if kept clean, this seeems to be one of the better answers.
Last Word: Beware of salt!