Coarse-grind the acorns then run them through a "Mr. Coffee" a few times until the resulting brew doesn't taste bitter. Then dry the acorn meal and grind it up finer for flour or just leave it as is for acorn porridge or to add to muffins.
-Blast
What would you do w/out a MR Coffee in a survival situation ??
Can you eat them w/out filtering that mcuh ?