If you are talking about a steam bath where the room temperature is high, then
you do not want to add more heat and add to the risk of increasing the fever. The same is true for hot baths, hot tubs, whirlpool spas, or showers. Being immersed in the heat is not a good thing with a fever and can be especially bad for the elderly, babies, and small children.
Increased humidity in the air can be good for other symptoms that might be present if the fever is caused by a cold or flu or sinus infection, so a cool air vaporizer/humidifier is good for this, and/or use of saline nasal spray (available at drug stores over the counter). A pan of hot water can be used to increase the humidity to sinuses, nasal passages and respiratory system if you drape your head completely with a towel or blanket with the hot water under it with you and breathe deeply.
It is advisable to take rest when one has fever
"Herbal plants" can be anything. The safe thing is to take what the doctor gives you.
It is not safe to use steam on wood furniture. The steam could stain the wood.
What do you mean by safe, for the environment, YES
Yes.
A recently killed crab is safe to steam. It is recommended that seafood be no more than four hours old from the time of death to be safe.
Cetirazine is an allergy medication and paracetamol is a pain medication and fever reducer. They are safe to take together.
Yes, in fact it is the safest since it is from the creators of the game.
Yes.
Boiling it and catching the steam makes it safe. The steam will not have the salt in it so it will be safe to drink. So all you need to do is figure out a still arrangement to catch the steam and allow it to cool itself back into water.
Steam
The steam will ruin the adhesive on the flooring.