I take a ziplock bag and attack it with a fork. You need to trap moisture but still allow it to breath some. I then place a damp, not soaked paper towel in the bag with the acorns (red oaks) and put in the fridge. Check once a month or so to ensure the paper towel remains damp. When they are ready they will produce radicals even in the fridge so be prepared. White oaks you should plant right away in my opinion to give them as much of a chance to grow yet this year as nature intended.