Hi back Buttoni, Dr. H is right about the tannins, they are the bitters of the acorns. You can either soak them for a day and change the water and repeat 3 days, OR; boil them and change the water 3 times to leach the tannins out. I learned that the Indians would put them into a basket and either leave them in a fast moving stream or even under a small waterfall for a few days to leach the tannins out. After drying, the acorns can be roasted and salted like peanuts, dark roasted and ground for coffee substitute, dried and stored or ground into flour for baking.
If you use them for baking, the flour will not always rise like normal flour. Use more baking powder and or yeast. Mix the acorn flour with cornmeal, wheat flour, buckwheat flour or rice flour and such for your hardtack, pancakes, ashcakes or a thickener in your soups and stews. You can also add these flours to your eggs when making omelets, scrambled eggs and such to stretch the eggs and feed more people.
If you have access to a cornfield, goldenrod plants or some cattails, harvest the pollen at the right time and add it directly to your mixture before making the dough and baking. You will get a lovely yellow color and more vitamins in your breads and cakes.
Making acorn and buckwheat tortillas with some salt, oil and maybe some boullion, will get you some stomach filling and nourishing "pocket" breads to take on fishing and hunting trips that will not go bad for days....tortillas and beef jerky, yes!! HAVE FUN and live free, Gary