Picking up and object and then dropping it again

I am trying to drop the axe at the player's feet.

public class playerController : MonoBehaviour {

 public GameObject playerObject;
 public GameObject Stone_Axe_db;
 public GameObject Stone_Axe;
 public bool hasStoneAxe = false;
 public bool axeEquipped = false;


 void Update()
 {
     if (Input.GetKeyDown(KeyCode.G))
     {
         if (axeEquipped)
         {
             //Create a new Stone_Axe object at the playerObject's position
             Stone_Axe_db.SetActive(false);
             hasStoneAxe = false;
             axeEquipped = false;
         }
     }
 }

 private void OnTriggerEnter(Collider collision)
 {
     if (collision.gameObject.name == "Stone_Axe" )
     {
         Stone_Axe_db.SetActive(true);
         hasStoneAxe = true;
         axeEquipped = true;
        //Get rid of the object 
     }
 }

}

I tried changing active from false to true, but I think that means its just the same object going invisible and visible again? I want to delete the object when I pick it up, and then create another instance of it when I drop it. I tried using destroy() and then instantiate() but I get errors.

Can someone please help me with what I need to put where the comments are to make this work? I am totally new to c# and Unity. TIA.