Soft 404
Haha! This is the real 'experimenting with thermistors' 
I did not received my thermistors yet (one of the last UPS update which I received by mail is An emergency situation or severe weather condition has delayed delivery. , so I will need to wait a little) but It would be riddiculous if they are not water resistant. Datasheet of every thermistor from the Kit mention that time constant is 3 second in water. So if they explicitly mention water, I gues they are designed for use in water and other liquids.
This datacheet (drawing) is avalaible at Molex website.
That "drawing" pdf file also has the "resistance vs temperature characteristics" chart with all the expected resistance values for the various temperatures listed (I'm assuming we'll all need that at some point). That's something I would have expected to see on the data sheet instead 
