Technically, it is possible to survive after eating any one of these things, just have to quick. Like, I can eat a chunk of dirt and still be fine until I have to go to the hospital and would still survive. So, my argument is that anything could technically be edible.
Well, anything is 'edible', but it wouldn't be considered as 'food' (like soap, obviously you can eat a bar and be just fine, but it definitely ain't food) probably for obvious reasons/ nutritional value.
As much as I doubt you should really be eating cotton or limestone, they do indeed appear to be edible (although I do think the amount of limestone you can eat has to be so small that it'd be better not to include it. And the fact it's just for pigment, you may as well call it paint). But I can't find anything saying dry ice is good to eat...
Human meat?!