I did some wild food foraging recently. Here are some pictures of chestnut oak acorns I boiled down and ate the other day.
It took 3 changes of water and the bitterness was completely gone though I did not think they tasted good, very bland. I will have to try mixing them with something next time to get more of a flavor.
The chestnut oak acorns are big (sorry nothing for scale in the picture). The big ones are about an inch long.
Here are some red oaks for comparison.
I also made tea from spicebush and had some very delicious autumn olives on a separate occasion. The autumn olives make my mouth very slightly numb.
I found a few rose hips I will save for tea and a golden birch twig as well.