Convert 3D object into 2D object via script

Hello,

I am trying to create a capsule at run time in my script that will shoot off of my player. However all of my players are 2D sprites, and the capsule is a 3D object. When I remove the 3D components in the script it works fine, but adding the 2D components wont work. I tried googling the issue but I could not find what was wrong with my script. I have tried adding 2D components onto a 3D object via the inspector in unity and that works. I am not sure what the issue is.

Thanks for any help in advanced!

 GameObject capsule = GameObject.CreatePrimitive(PrimitiveType.Capsule);
 capsule.transform.localScale = new Vector3 (.1f, .1f, .1f); // need to make or bullet not gigantic
 
             if(tag % 2 == 0)
             {
                 Blue = GameObject.FindWithTag (tag.ToString ());
                 capsule.transform.position = Blue.transform.position;
 
             }
 
             else
             {
                 Red = GameObject.FindWithTag (tag.ToString ());
                 capsule.transform.position = Red.transform.position;
             }
 
             Vector2 movement = new Vector2 (-1, 0);
 
 //need to convert capsule into a 2d object so that it will interact with the rest of the game
 
             //we need to convert the capsule to a 2d object so that it will interact with the rest of our game
             
             //UnityEngine.Object.Destroy(capsule.GetComponent<Rigidbody>());
             //UnityEngine.Object.Destroy(capsule.GetComponent<CapsuleCollider>());
             
             
             //capsule.AddComponent<Rigidbody2D>();
             //capsule.AddComponent<BoxCollider2D>();
             //capsule.rigidbody2D.velocity = movement * speed;
 
 
         }