I know a few people have their fog lights tapped into their side markers or parking lights - so the fog lights will be on whenever the side markers, dash, and parking lights are on. A few people have purchased the fog light bezel and switch (which you should be able to order from Toyota if you have the parts number, and I believe a few vendors here on the forum sell something similar as well) and have redone the wiring so that they can have a separate button that controls whether the fog lights are on or off.
Here are a few threads I visited when I was considering this myself, before I just decided to get the DD kit and wire it to the headlights as per the instructions -
http://www.ft86club.com/forums/showthread.php?t=52984
http://www.ft86club.com/forums/showthread.php?t=67016
Hope that helps you narrow down your search a bit - GL if you're set on doing this. I definitely wanted to, but decided it wasn't worth the hassle since I didn't really know what I was doing and I live in a city where the cops might make a stink about driving around with them on anyway.