GRAND AM 2001 How do I remove the reverse light compartment on bottom right of your bumper took the light out and didn't replace it right away now it's full of water?

Remove the retaining nuts holding the housing in then push the light assembly outward from the rear fascia. I just had the same problem with my '03 Grand AM GT. Well, similar problem - in my case somehow the socket was dislodged and I found the harness hanging down with the reminents of the light bulb! Needless to say I had nice pool of water in the reverse light housing.