Making Inventory System Work for Multiple Food Types

I have a bomb inventory system implemented but right now I only have it working for 1 item (a piece of cake). How can I make this work for multiple types of food without copying and pasting my scripts over and over!

My script I put on the player:

public class InventoryItems : MonoBehaviour {

 Foods foods;
 public Inventory inventory;
 Text text;

 public int numOfCakes = 0;
 public int cakeW = 1;
 public int cakeS = 2;

 void Awake()
 {
     numOfCakes = ES2.Load<int>("numOfCakes");
 }

 // Use this for initialization
 void Start () {
     foods = FindObjectOfType<Foods>();
     text = FindObjectOfType<Text>();
 }
 
 // Update is called once per frame
 void Update () {
     
 }

 private void OnTriggerStay(Collider other)
 {
     if (Input.GetKey(KeyCode.E))
     {
         if (other.tag == "Food")
         {
             if (foods.currentHungerPoints >= 1400
                 && inventory.weight + cakeW < 30
                 && inventory.size + cakeS < 40)
             {
                 numOfCakes += 1;
                 inventory.weight += cakeW;
                 inventory.size += cakeS;
                 Destroy(other.gameObject);
             }
             else if (foods.currentHungerPoints + foods.cakeCal >= 1500
                     && inventory.weight + cakeW > 30
                     && inventory.size + cakeS < 40)
             {
                 text.text = "Too heavy to carry!";
                 return;
             }
             else if (foods.currentHungerPoints + foods.cakeCal >= 1500
                     && inventory.weight + cakeW < 30
                     && inventory.size + cakeS > 40)
             {
                 text.text = "Too bulky to carry!";
                 return;
             }
             else if (foods.currentHungerPoints + foods.cakeCal >= 1500
                     && inventory.weight + cakeW > 30
                     && inventory.size + cakeS > 40)
             {
                 text.text = "Too bulky and heavy to carry!";
                 return;
             }
         }
     }
 }

 void OnApplicationQuit()
 {
     ES2.Save(numOfCakes, "numOfCakes");
 }

}

And my other script that I put on my Inventory canvas

public class Inventory : MonoBehaviour {

 public Text text;
 public Button button;
 Foods foods;
 InventoryItems inventoryItems;

 public int weight;
 public int size;

 void Awake()
 {
     weight = ES2.Load<int>("weight");
     size = ES2.Load<int>("size");
 }

 // Use this for initialization
 void Start()
 {
     foods = FindObjectOfType<Foods>();
     inventoryItems = FindObjectOfType<InventoryItems>();

     Button btn = button.GetComponent<Button>();
     button.onClick.AddListener(OnClick);
 }

 // Update is called once per frame
 void Update()
 {
     text = FindObjectOfType<Text>();
     text.text = "Inventory: Can carry 30kg/40L\n\n"
     + "\nCakes: " + inventoryItems.numOfCakes
     + "\n\nCurrent Weight: " + weight + "\nCurrent Size: " + size;
     ES2.Save(weight, "weight");
     ES2.Save(size, "size");
 }
 public void OnClick()
 {
     if (inventoryItems.numOfCakes > 0)
     {
         inventoryItems.numOfCakes -= 1;
         weight -= inventoryItems.cakeW;
         size -= inventoryItems.cakeS;
     }
 }

}