The iced coffee problem has been solved! (Alex E, are you reading?) Thanks to James and Lori, I checked out the Port Credit Starbucks. Lo and behold: ice brewed coffee and the horrendously named but delicious iced Americano. I don't know where there are Starbucks in Toronto, but I'll soon be learning.
I'm also going to tell Second Cup, for what it's worth, that I'd rather spend my loonies there, if only they'd satisfy my summer craving.