Unsolicited fun fact: you can test whether a berry is poisonous by first rubbing it on your skin, if there’s no reaction, rub it on the outside your face. Nothing? Rub it on your lips. Then eat a tiny bit. Then eat more!
Note: give yourself considerable time between each of these steps. Rub on arm, wait fifteen minutes. Rub on cheek, 30 minutes. Rub on lips, wait an hour. Put a bit on your tongue, and spit - wait two hours. Eat the teensiest bit, and wait 8 hours. If you still haven’t had a bad reaction, then maybe eat a berry or two, and wait another 8 hours.