Yes. Wiggy's also has a steel bottle:
http://www.wiggys.com/moreinfo.cfm?Product_ID=100&CFID=47440&CFTOKEN=86575741

I like the idea of purifying my entire water supply at once by boiling. Of course the bottle is less stable than a kettle, although it does have a lip at the top which would allow hanging it with a tight loop of steel wire (or hose clamp) above the fire.