I've been in the woods camping with voluntaryists. First of all, we all do use currency, of various kinds. Trade occurs amongst all free humans too, but currency like cash, crypto, or metals are used as mediums of exchange.

Also, most voluntaryists I have had the pleasure of dining with, camping with, or hanging out with in general, are way smarter than the average idiot who would leave food in his tent in bear country. :)

Not to mention, if a person did that and was ignorant as to the danger, chances are he will listen to the advice of his friends when several of them say, "Woah, dude. Bad move." Lol

Honestly from the hundreds of anarchists Ive met and known, I generally have to say I've never run into a more considerate, and easy to get along with group of people. :)