Make instantiated object follow player or another object

I'm trying to make an instantiated object to follow my itemSpawn object. But when i click in an area the object gets instantiated but i doesn't follow my itemSpawn.

Main code thing:

 using UnityEngine;
 using System.Collections;
 
 public class Grabitem : MonoBehaviour {
 
     public GameObject greenLiquid;
     public GameObject blueLiquid;
     public Transform itemSpawn;
     public GameObject player;
     public static bool holdGreenLiquid;
     public static bool holdBlueLiquid;
     public static bool destroyItem;
     private bool used;
 
     // Use this for initialization
     void Start () {
         player = GameObject.FindGameObjectWithTag ("Player");
     }
     
     // Update is called once per frame
     void Update () {
         itemSpawn = GameObject.Find("Player").transform;
 
         if (holdGreenLiquid) {
             if (!used) {
                 Instantiate (greenLiquid, itemSpawn.transform.position, itemSpawn.transform.rotation);
                 Debug.Log("Should Instantiate");
                 destroyItem = false;
                 used = true;
             }
 
         }
 
         if (!holdGreenLiquid) {
             destroyItem = true;
         }
 
     }
 
 
 }
 

Code for checking collision and mouse input on the object:

 using UnityEngine;
 using System.Collections;
 
 public class GreenLiquid : MonoBehaviour { 
 
 
 
     void OnMouseDown () {
         if (Input.GetButtonDown("Fire1")) {
             Grabitem.holdGreenLiquid = true;
             Debug.Log("Working");
         }
 
     }
             
     
 }
 

Destroy the object if it is used:

 using UnityEngine;
 using System.Collections;
 
 public class Destroy : MonoBehaviour {
 
     public Transform position;
 
     void Update () {
         if (Grabitem.destroyItem == true) {
             Destroy(transform);
         }
     }
 }
 

Any help is appreciated :)