Languages used in India are usually not well supported on ePub readers. In particular, the display of vowel signs causes problems.
Generally speaking, the following approach should theoretically work:
1. Convert your source text to Unicode text or html files.
2. Create a new ePub with Sigl
, add your source files to the project and format them or convert your source files with Calibre
3. If the iPad fonts don't support Kannada, also embed a free Kannada font in your ePub.
4. Test your ePub on your device. Make sure that all vowel signs are correctly rendered.
I created a quick and dirty Kannada epub from a random newspaper article. If it displays fine on your iPad, you can use it as a template; if it doesn't, the iPad most llikely doesn't support Kannada in ePubs.