What can I do with bad coffee beans? I recently was about to have a week before I could get my good coffee, so I went to the grocery store and got some of theirs. 

Unfortunately, I pulled the lever and got way more grocery store coffee than I could ever need. 

It's also terrible. Short of tossing it, is there anything I can do to make it taste better until I get good coffee again?
Cold brew it! Make sure you start with very cold water and a coarse grind. Cold-temp chemistry has a better chance of taking what's good and leaving what's bad.