We bring a First Aid kit with us on all trips. With larger groups we strongly recommend that you take something similar with you. We will arrange for blankets to be available at the site. We do, however, strongly recommend that groups purchase sleeping bags for overnight trips. If the group is split then, perhaps the school organiser can arrange to borrow from the others.
All water comes from reputable companies which process and sterilise the water.
Ice is bought locally from approved shops. There should be no problem with drinking water and ice. Food will be prepared accordingly. Please make this clear at least the day before such special types of food are required. The precautions taken above should minimise this.