Convert MySQL PHP Code to include MySQLi Prepared Statements

ONLY BID IF YOU CAN START AND COMPLETE IMMEDIATELY! Simple Task - Convert this short piece of code to include prepared statements for efficiency and security. I'm aware it's poorly designed thats what I need you to fix. Plenty more work for best cost and quality work, $mysqli = new mysqli($servername, $username, $password, $dbname); /* check connection */ if ($mysqli->connect_errno) { printf("Connect failed: %s\n", $mysqli->connect_error); exit(); } if ($_GET['sort'] == 'date') { $sort_query = 'outbounddeparture ASC';} else {$sort_query = 'priceperadult ASC';} $form_airport = $_GET['form_airport']; $form_lessthan = $_GET['less-than']; $from_month = $_GET['month']; $date = $from_month; $startdate = date("m", strtotime ( $date ) ); $enddate = date("m", strtotime ( '+1 month' , strtotime ( $date ) )); $destination = $_GET['form_destination']; if ($from_airport == 'LON') {$airport_query = " AND outbounddepartureairport IN ('LHR','LGW','STN','LTN','SEN')";} else{$airport_query = "AND outbounddepartureairport = '{$form_airport}'";} $query = "SELECT MIN(priceperadult), hotelname, priceperadult, duration, outbounddepartureairport, deeplinkurl, hotelidentifiercode, outbounddeparture FROM search_results WHERE priceperadult < '{$form_lessthan}' ".$airport_query." AND outbounddeparture >= '2016-{$startdate}-01' AND outbounddeparture < '2016-{$enddate}-01' AND outbounddeparture < '2016-{$enddate}-01' AND holidayresort = '{$destination}' GROUP BY hotelname ORDER BY {$sort_query} "; $result = $mysqli->query($query); while ($row = $result->fetch_assoc()) :?> ...........