models.php

class Chinas{

  public function botella()
  {
    return $this->belongsTo('App\Botellas','botellas_id'); 
  }
}

class Botellas{

  public function chinas()
  {
    return $this->hasMany('App\Chinas','botellas_id'); 
  }
}


// this should work now
function index()
    {

      $chinas = Chinas::all();

      foreach ($chinas as $china) {
        echo $china->name . " ". $china->botella->name .  "<br/>";
      }

    }