Louis Pasteur did some experiments like 200 years ago regarding bacteria. He found that a sealed container like your fermenter was most succeptable to contamination from holes in the top, but when he placed a bent tube (looked kinda like that instrument the guy plays on the Ricola commercial) on top of the sealed container (like we do with the airlock) most contamination was kept out because most bacteria fall straight down assuming there is little air current in the room. It is because of this that I would say you're 'ok'.
Pretty good for a Frenchman, eh?
You can use any liquid in the airlock, but it is probably best to use something sanitary like sanitizer water of high proof alcohol, as you did. They if it does get into the beer, at least it should be sanitary. I use star-san water myself.
About your yeast: only put new yeast in if you don't see signs of fermentation after 36 hours. It won't hurt if you just want to throw some in now for peace of mind. Rehydration is good but not required.
Uh oh...Airlock problem?
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