Helpful time-saving measure: Don't draw panels at all!
Actually, the "missing" panels are used here to denote passing time, so it's not a total cheat, it's an artistic choice.
The faucet in panel 1 was drawn from the following image:
The bathtub was modelled, for the most part on this one:
Panel three is an important one, on which much of the plot hangs, though it was completely unintentional. At the time I drew it, I was only trying to work out what sort of things one would do in a bathroom after taking a bath. It seemed that ingesting a couple aspirin would be completely reasonable. Keep this in mind. I'll come back to it.
The last CD I listened to during the making of this comic was David Bowie's "Reality."
After this, the rest was silence. Mainly because I didn't have the mental energy to devote to picking out something to listen to.