I wonder if just soaking them is enough. I believe most natives would soak them in running water to better pull out the tanins. Changing the soak water every day would probably help.

Easiest thing would be just to try it.
1. whole nuts in still water 1 week
2. partially crushed acorns in still water 1 week
3. whole acorns, water changed every day for a week
4. crushed acorns, water changed every day for a week

At the end of the week taste them and see how they arre. The amount of tanins in the acorns varies from tree to tree so what works for your tree may not work for someone elses.

-Blast, trying to be scientificy