{{kint(transaction[0])}}

<b>$ {{transaction.amount }}</b> total donation<br/><br/>

<b>$ {{transaction[0].amount }}</b> total donation<br/><br/>

function touchdownclub_theme($existing, $type, $theme, $path) {

 return array(
    'touchdownclubtransaction' => array(
      'variables' => array(
        'transaction' => NULL,
      ),
       'template' => 'touchdownclubtransaction',
    ),
  );
}

$result = db_query
$output = $result->fetchAll();