Wash the chicken under running water, pat dry and cut into fine strips. Peel, wash and cut the carrots, celery and potatoes into fine cubes.
Bring the water to a boil in a saucepan, add the meat and vegetables and cook covered over a moderate heat for about 15 minutes. Pour in the rapeseed oil and carrot juice and puree everything with the hand blender.
Serve 1 portion of porridge immediately, allow the remaining portions to cool, fill in freezer jars and freeze.