I would eat a very small amount of one mushroom to test for poison. If I feel ok after several hours, I'll eat more. Then repeat for the other. While waiting during the poison-test, I'd forage for fruits and edible roots, would try to observe what the local animals are eating. I wouldn't spend more than half a day on this however, as the priority is finding a way out, and humans can survive for a long time without eating anyway.

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