Best and easiest attractant to aquire would have to be your own spit. Read an article on how human sweat and oil will repel fish however human saliva will attract them. Im not suggesting andone lick there pillie before tossing it or french kiss your live herring, but a quick spit and rub wouldn't go astray. I cant say this has drastically improved my personal catches but it posatively hasn't effected it negatively.
Ryno
I believe the article was in "Ron Calcutts Complete Book Of Fishing."