Soak the apricots in the water for at least 4 hours or overnight in the fridge.
Add the apple juice, cinnamon stick, allspice, ginger and vanilla bean to a saucepan. Bring almost to boil, then turn heat to low and simmer for 10 minutes. Take off heat and let it cool a bit.
Add the apricots and the soaking water to a blender and blend until smooth.
Add the pumpkin purée and nutmeg and blend again.
Strain the apple juice mixture into the blender to make sure only the liquid comes through. Blend until smooth.
Put a fine mesh strainer over a pitcher and strain the pulp so that only the thick juice drips into the pitcher. Sprinkle with ground nutmeg before serving.