Reusable straw case
As plastic straws are becoming less common, people may carry their own reusable straw with them. Straw cases are widely available, so this would be a rather normal, rod-shaped, nearly foot-long object, that could be adorned at the tip and be made of any material without drawing much attention. Bonus points if the wand actually opens and has a removable hollow core that could really be used as a straw - the wand isn't just disguised as a straw and case, it actually is one. This object is only slightly unusual, and is probably about as lightweight and compact as the dimensions of the wand allow.