That's a long distance. Best is to go to Mysore or bangalore first. From Bangalore you can reach coorg in 5hrs via Mysore. Halt for Thatte idli in bidadi enroute to Mysore.
There are many tent stay options for tourists in Coorg made available by many estates and resorts. Major tent stay providers are concentrated around Madikeri and finding such experiences away from ci (Read More)ties like Madikeri, Kushalnagara, Virajpet, etc. are difficult.
There are budget hotels in Madikeri where you can lodge your students. Hilltown Hotel is one good option. You can talk to the hotel owners and arrive at a reasonable deal since it is a group booking. (Read More)