I have a nº 2, with some other branding and it is ok, there are very cheap compatible tips on ebay so you can order what you need for a few bucks.
Just stay away from the very cheap 220V (or 110V in your case) AC irons where the tip is just a cooper(ish) rod, most of the times they will just burn the pads out from the PCB, an iron like the nº 2 will not.
About solder, choose something with about 0.6 - 0.8 mm with rosin core (no acid flux core), any 60/40 (60% lead, 40% tin) will do, but if you can spare just a bit more go for a 63/37, they look to be a bit better. But if you're buying solder from china remember that you'll get what you're paying for... not much :-(
If you're using a wet sponge, distilled/deionized water is just a bit better but, really, for you or me it is not important. But grab a brass "sponge" it is much better and will not cool your iron.