Egg whites can be kept covered in the fridge for a few days, but if you have several, it's best to freeze them. Pour each egg white into a compartment of your ice cube tray and freeze. When you want to use them, defrost them at room temperature.
Egg yolks dont freeze well and can dry out after a day in the fridge by itself. In an airtight container, cover with a bit of water and place in the fridge. They will keep for 2-3 days. Just drain the water before using.
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With all the holiday cooking, there is bound to be some that use only half the egg.