Using items from inventory

Hello all my game is coming along great thanks to all the help from everyone in the community i am here again to ask for some guidance I downloaded the free inventory system that Brackeys made available for free https://www.assetstore.unity3d.com/#/content/10384 I got it into my game its working the only thing is that when I use say the water to replenish the thirst bar the hunger bar and energy bar also go up, and I only want to affect the thirst bar when I use the water here is the script

 #pragma strict
 
 //This script allows you to insert code when the Item is used (clicked on in the inventory).
 
 var deleteOnUse = true;
 
 private var playersInv : Inventory;
 private var item : Item;
 
 @script AddComponentMenu ("Inventory/Items/Item Effect")
 @script RequireComponent(Item)
 
 //This is where we find the components we need
 function Awake ()
 {
     playersInv = FindObjectOfType(Inventory); //finding the players inv.
     if (playersInv == null)
     {
         Debug.LogWarning("No 'Inventory' found in game. The Item " + transform.name + " has been disabled for pickup (canGet = false).");
     }
     item = GetComponent(Item);
 }
 
 //This is called when the object should be used.
 function UseEffect () 
 {
     Thirst.tcurHP += 25;
     Hunger.curHP += 25;
     
     //Play a sound
     playersInv.gameObject.SendMessage("PlayDropItemSound", SendMessageOptions.DontRequireReceiver);
     
     //This will delete the item on use or remove 1 from the stack (if stackable).
     if (deleteOnUse == true)
     {
         DeleteUsedItem();
     }
 }
 
 //This takes care of deletion
 function DeleteUsedItem()
 {
     if (item.stack == 1) //Remove item
     {
         playersInv.RemoveItem(this.gameObject.transform);
     }
     else //Remove from stack
     {
         item.stack -= 1;
     }
     Debug.Log(item.name + " has been deleted on use");
 }

the problem starts at line 25 where I added the function to be able to use the pick ups any help on how to repair this will be greatly appreciated have a great weekend and happy game making. -K