What to do for a bullfrog?

I found a bullfrog sitting in the middle of a road in our office park. I relocated it to the grass along the road, but there really isn't any water (pond or otherwise) within 1/4 mile. Should I just leave it there or take it to a place with some decent water?

I've heard they're rather territorial, so I'd hate to drop it in a location that was hostile. It's quite large. Easily 1 1/2 average-sized male fists.

Thanks in advance!