can you use watered down bleach to sanitize the shot glass to add the spors in
why not get a bottle of 91% alcohol it's like a 1$ to 2$... bleach is pretty strong stuff and I would be worried some would get into the spore solution itself and kill them...
I would also go with the alcohol.
Most places say to go with alcohol, I'd suggest it because it will evaporate fairly fast after you wipe the shot glass with it, where as bleach will stay in there until air dried or you dry it yourself
I'm more comfortable using alcahol, screw measuring out bleach/water ratio's.
pw