A tip from a fellow named Hank Gruben that was published fairly recently in FSM:
"A simple solution is to use Testor gluing tips to create a double-air chamber on the bottle top that prevents the glue from drying out. They're tube glue tips, but they fit most super glue bottles...Eventually [they] may need to be replaced because they clog, but it's cheaper and easier than replacing an entire bottle of glue."
I've begun doing this a short while back and it seems to work; I definitely am having less trouble with the super glue bottle clogging!