Take an empty large plastic container and start putting the spoonful or two of vegetables that are leftover after a meal. Store in the freezer. Any time that you are roast a chicken or turkey, throw the extra juices in the plastic containers. Keep layering all those wonderful leftovers in the freezer containers until they are full. Do not worry about seperating the vegetables. Mix them up. Bits of meat can go in there too if you desire. Just avoid putting fatty bits. When you have one or two full containers, put them on the stove for a simple base for a soup!
If you have saved up enough drippings, you will basically just be able to thaw out a wonderful chicken veggie soup from your freezer. Add just a bit of salt or pepper. Maybe some onion or garlic (powder or fresh for either). Save up all summer when veggies are more plentiful, and you can have plenty of soup base all winter long.