Gst on yoga teacher training institution not registered u/s 12aa

A firm provides Yoga Teacher Traning classes, the fee for such classes includes the price of food, accommodation, adventure activities, travelling. My question is how should they chagre gst on such fee. Either straight away 18% of such fee or such fee should be further bifurcated into diffrent categories like food charges, accommodation charges, travelling charges, adventurous activities charges and charge gst accordingly. For food the firm has the mess facility, for accommodation the firm has there own building, for travelling the firm use own vehicles.