Apple cider is a healthful drink, rich in pectin's, minerals and particularly potassium and flavinoids. The cider can be served cold with club soda, or warmed with spices. (See several ideas below.)
Always keep cider refrigerated (like milk) or it will begin the fermentation process. At the beginning of this process there will be light bubbles and a tinge of alcohol. Further along, you will have strong cider, and finally, fermentation process (ending with apple cider vinegar).
If you want to keep the cider fresh for many months of enjoyment, pour off about a cup of cider to allow for expansion, and freeze the remainder in the original container.