water.
while the chicken is boiling, dice up the 2 large carrots and 2-3 celery stalks. when the chicken is done cooking, carefully remove the chicken from the boiling water and set on a plate to cool down. at this point, you may need to add more water, about half of a pot full. then bring the broth back up to a boil.
the next step for your chicken rice soup is to add the carrots and celery to the boiling water. boil them until they are tender, about 8 minutes.
when the veggies are done, if the chicken is not yet cool enough to handle, you can turn them off. once the 