RobertUI 

I had this exact scenario a few years ago (mine was 4.5 miles), I did what others have suggested and picked up an old mountain bike (rigid front and back) and rode the crap out of it. I think the bike was about $50 for a '97 Diamond Back Sorrento. I kept any part that wasn't painted lubed at all times, and then never gave it a second thought. The only thing I did was made sure to park it in the shade (I didn't have coverage) because I didn't want the tires to get sun damage. It got rained on A LOT and snow always piled on it in the winter. Made for a GREAT commuter, and because it was fairly ugly and old, it wasn't a good theft magnet! I did replace the QR skewers with some that require an allen wrench (I'm actually using these types on any bike that I lock up).