If you've got 24 hours to prepare, why aren't you leaving?

Unless you can build a fireproof shelter within 24 hours, if the fire is big enough it will kill you, or burn you so badly you'll wish it had killed you.

The only other solution would be using a fire shelter and hope it flashes over you.

I had the misfortune of being caught in a flashover fire a number of years ago while photographing a wild fire in Glendale CA, it overtook the truck and crew I was with in a matter of seconds, we are all extremely lucky to be alive, the truck saved our lives.

You don't want to put yourself or your loved ones in that position, there is virtually nothing that an individual can do to survive direct contact with a wildfire except be very, very lucky.
_________________________
JohnE

"and all the lousy little poets
comin round
tryin' to sound like Charlie Manson"

The Future/Leonard Cohen