How to re-download deleted podcast on phone iPhone

I downloaded a podcast via my phone, deleted it, and need to re-download it but it isnt giving me a download button and will only let me listen/stream it. How do I re-enable the ability to download it?
While set to manual, it is synced (manual) to my home computer and Im not at home, so I do not have the option of downloading it via iTunes on my computer and transfering it to my iPhone. I need to know how to re-downloaded a deleted podcast on the phone itself.
PowerBook G4 1.67 17" (June 2oo5) 2GB RAM Mac OS X (10.5.8) iPod 5G 60GB iPhone 4 32GB