I bought a little bottle of organic Eucalyptus Radiata a small diffuser call HerbalAir diffuser and added 60 mil of water and 3 to 5 drops of the oil. It has been almost a day. It lets off this cool mist and he sleeps right next to it and works for three hours.
He tried to cough and could not .. I am bit flabbergasted... to say the least.
It works ! I am hoping I bought another decade with this little guy.
Here is a link for the diffuser.
https://www.bedbathandbeyond.com/sto...F0waAmi38P8HAQ