Very easy, and reminds me of apple pie! I have two cups per day.
Per mug - 2tsp apple cider vinegar, either 1/4tsp ground ginger (or grated fresh) OR 1/4 tsp mixed spice, hot water. Good stir and enjoy.
Apple cider vinegar is a great diuretic and good at maintaining potassium levels, has loads of health benefits and it is a really warming drink.