First of all, thank you very much for taking the time to post! :-)

Most third-party wireless adapters (such as the ones that come with non-Bluetooth wireless keyboards) will be recognized by your Mac without any drivers. Therefore, it is worth trying to plug your existing keyboard and mouse (if applicable) to your Mac and see if they work out of the box. In most cases, manufacturers have released Mac OS X drivers that add functionalities to their products but are not required for normal use.

There is of course a way to add bluetooth to your Mac, as long as it has a free USB port (if possible, directly on the computer, not on a hub). Simply purchase a D-Link Bluetooth adapter from the Apple Store and apply the firmware updates released by the Apple engineers that install on this adapter as well as the internal modules.

While plenty of other third-party Bluetooth modules will be recognized by Mac OS X and work, they won't provide you with all the advanced technologies that the Apple Wireless Mouse and Keyboard have been designed to take full advantage of. This is why I would recommend purchasing the D-Link adapter directly from Apple -- or to make sure that your get the right model and version if you go through a reseller.

Let me know if this helps!

F.J.