This seems like the kind of report they'd show as a flashback in a post-apocalyptic film :)
1. The amount of time from now the collapse occurs. (most likely a logrithmic scale)
2. How far civilization falls, e.g. "back to the 19th century" or "back to the stone age"[2].
3. How "wierd" this makes the world, e.g. are there 40 degree temperature shifts in the afternoon in San Diego and warm beaches in Antarctica. Are there now hyper-intelligent wasps running the show. Do we discuss the "fragility of the fabric of space-time" much more frequently.. and so on.[3]
Finally, every "square" is actually in a state of superposition, based on the answer to the question "are there zombies[4] now" at the time of selection. Therefore if you are sure 10 days from now, early 16th century avg tech, wierd factor of .09, put in $400 worth of goods to catch the both zombies outcomes.
Winners will be chosen at the END of the collapse, before the rebuilding period. The winners will be given the location and secret combination to enter the cache. Transport and armed escort will not be provied by me or any other participant of this pool, (except by other arrangement out of scope of the pool) nor will any other form of survivability enhancement until reaching the cache.
[1] Entry fee must be in the form of non-perishable food, ammo, guns and other items traditionally considered valuable post-apocalypse
[2] Avg tech level does not include the fact that various warlords, mad scientists, intelligent creatures and other bad guys will have access to various tech remnants and caches... This is strictly about the level of technology and civilization available to the average person.
[3] Weirdness factor algorithm tbd, but it will be normalized on a 0-1 scale, with the current state of the US being .27.
[4] Zombies here includes both new and old style zombies, some forms of mutant, possibly mind-control victims, and certain types of insectoid horde. All other types of undead, mutants and creatures, as well as those with supernatural powers are actually just manifestations of the wierd factor (see [3]).