This is what I use. Yes, I know it's from Wal-mart, but it works great. I usually only cook over the fire while camping. I can take the kettle and put it on top of two logs with some nice hot coals between them and let it get to a nice boil. I even bought the exact same kettle in blue with a peculator in it to make coffee for others and it work perfect every time.
If you take a tea kettle and modify it with a copper coil attached to the steam outlet, then you can not only boil water, but you can distill it too by collecting the steam and letting it condense into another container.
When alone I have a restauran sized, I think it's 10 oz., stainless tea pot. when with others I use a larger tea pot, up to a 1qt size. All stainless, no aluminum. I used to have aluminum teapots, but they wore out.
agreed, the enamel ware stuff works great. I will admit tho, I have a hard time getting the perculators to work properly in them, so for coffe, I use the coffee in a teabag things and just boil the water
I have a couple antique cast iron tea kettles, but I just have them sitting on the fireplace hearth, I have never actually used them