Rosemary Aromatherapy Best Aromatherapy Methods?

Best aromatherapy methods? - rosemary aromatherapy

I need something to a room with my children, all night, his high congestion and cough from colds and flu. I have the plug Sudacare steam, but not as natural or beneficial because it would be pure aromatic oil. There are many different methods. I do not want to spend more than about $ 50 on a device. I see that the burner tea light enought to be well or long enough to do work, I do not want a burning candle left unattended overnight. I want to be able to .. working all night without fire. Which method is better, the room is small - probly 12 'by 14'.

What oils do you use for colds and flu? Eucalyptus and rosemary, that is to read well.
Links would be great.
Thank you.