How do I assign a game object ocean to water in the code.

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.Rendering.HighDefinition;

public class Floating : MonoBehaviour
{
    public Rigidbody rb;
    public float depthBefSub;
    public float displacementAnt;
    public int floaters;
    public float waterOrag;
    public float waterAngularOrag;
    public WaterSurface water;
    WaterSearchParameters Search;
    WaterSearchResult SearchResult;

    private void FixedUpdate()
    {
        rb.AddForceAtPosition(Physics.gravity / floaters, transform.position, ForceMode.Acceleration);

        Search.startPosition = transform.position;

        water.FindWaterSurfaceHeight(Search, out SearchResult);

        if (transform.position.y < SearchResult.height)
        {
            float displacementMulti = Mathf.Clamp01(SearchResult.height - transform.position.y / depthBefSub) * displacementAnt;
            rb.AddForceAtPosition(new Vector3(0f, Mathf.Abs(Physics.gravity.y) * displacementMulti, 0f), transform.position, ForceMode.Acceleration);
            rb.AddForce(displacementMulti * -rb.velocity * waterOrag * Time.fixedDeltaTime, ForceMode.VelocityChange);
            rb.AddForce(displacementMulti * -rb.angularVelocity * waterAngularOrag * Time.fixedDeltaTime, ForceMode.VelocityChange);
        }
    }
}