The new bothy at Camasunary lies on the east side of the bay and sleeps up to fifteen people. There's no fire or stove but the walls are well insulated. If you want a fire, go down to the beach and leave no trace.
As with all bothies, this is a free communal place so if it's full you'll need to camp elsewhere. Leave it clean and tidy, take all rubbish away with you and don't disturb the nearby lodge. Consider joining the Mountain Bothies Association for £25 per year to contribute towards the building and maintenance of bothies.