if you dont know what you're getting into then Dont Touch the toilet. people that arent familliar with plumbing shouldnt try to plumb ( no offense intended at all )
if the toilet was filled with .... umm...... product, then i would suggest airing it out fast and disenfecting with a cleaner all that you can. mostly you need air to get at the water and time.
heat and Stagnent air are what mold will thrive on.
go buy some fans for cheap and put them to good use, hire a plumber to fix your toilet.