I have a DHT11 module already mounted with resistor. I don't even know what are the components.
http://www.selectronic.fr/capteur-d-humidite-et-de-temperature-dht11-electronik-brick.html
Concerning the salt test, here is the corresponding graph (legends in french, sorry 
) :
at t=0min i put the sensor inside the container. Before, it was in ambiant air : 17°C 39%RH
It stayed in the container all night long, and the day after I had 67% RH
Oh, and btw, the sensor keeps on saying my home is around 17/18°C... I don't think it's this cold. I'd say at least 19°C. I should double check that. I made another temperature sensing setup with a NTC thermistor, but it also needs calibration...