I've been told that all Apple warranties are worldwide. After all, people travel. You may have to send it in to Apple, though, you might not be able to hand it in at a local reseller. Still, there's not much that can go wrong with an ipad -- I'd be surprised if you needed to use your warranty.
The charger cord is the same as the sync cord, ipad interface on one end and USB on the other. Any charger that has a USB socket could be used. The charger that comes with US ipads is 120/240 v, so you'd just need the plug adapter. About as easy as it can be.