For your own content on a K2, the only option is the MOBI format (which the Kindle calls AZW). Amazon has an e-mail conversion service, which costs $0.15 per MB if you want Amazon to send the result directly to the K2 but is free if you instead get it back via e-mail. It is always possible to transfer DRM-free (unencrypted) MOBIs to the K2 via USB from any desktop computer. There are several other ways to format shift to MOBI, with Calibre (has its own forum here) being the most general.
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