Well, the best thing you can do is to put all your floppies into a shielded and dry box...
The best shielding is a box covered (or made) with lead... But It could be hard to find one...
The "standard" shielding is an aluminium or steel box. These are easy to find (IKEA's EMU box, for example).
And for the humidity control, you can use those silica gel packs that are inclued in some electronic devices' packages.
I have all my floppies stored such way, and they seems to be right for now.
