public void GrabPotion()
    {
        for (int i = 0; i < potionList.Count; i++)
        {
            Potion    p  = potionList[i];
            Transform pt = p.GetPotionObject().transform;

            if (playerScript.GrabPotion(pt.position.x, pt.position.z, pt.position.y))
            {
                Destroy(p.GetPotionObject());
                potionList.RemoveAt(i);
            }
        }
    }