not only 'can' you try them on at the drill..
you'll HAVE to put them on at the drill (the CMs will show you how...i wasn't sure how to put it on until they showed us)...
also, since you mentioned the titanic...unlike the titanic, there are enough lifeboats for all on board (passengers and crew)...also, the magic and wonder sail in warm water (not like the titanic that went down in ice water...)...
finally, when the magic had a fire a few months back, several other cruise ships immediately answered the just in case call and were nearby to evacuate the ship had it come to that (it didn't, but it's nice to know the other cruise lines immediately answered the call)....