The easiest way to make hot spiced cider is this:
Pour as much cider as will fit into a crockpot.
Toss in 3 or 4 Celestial Seasonings Cinnamon Apple spice teabags.
Heat the cider in the crockpot for a couple of hours and serve.

You can also use this traditional recipe with whole spices.
2-2/3 C apple cider
1-1/3 C water
1 cinnamon stick
1/2 tsp whole cloves
1/2 tsp whole allspice
Simmer for 10 minutes.