Soak 1 cup sliced raw almonds with 4 cups water in a large bowl for 4 hours or overnight. Transfer all to a blender. Puree until milky, 3 to 5 min. Pour into a sieve lined with cheesecloth. Push through sieve using the bottom of a ladle. Discard pulp. Stir in 1/4 cup honey or maple syrup. Refrigerate up to 3 days.