[at the camp, Mattie tastes the water]
Mattie Ross: That tastes like iron.
LaBoeuf: You're lucky to be where water's so handy. I've seen the time I've drank out of a filthy hoofprint - and was glad to get it.
Rooster Cogburn: If ever I meet one of you Texas waddies who ain't drunk water from a hoofprint, I think I'll... I'll shake their hand or buy 'em a Daniel Webster cigar.
[points to LaBoeuf's shaggy horse]
Rooster Cogburn: How long you boys down there been mounted on sheep?