I don't know about making a Bundle, but you can put prerequisites in the PREREQ_PM section of Makefile.PL and CPAN will load them as needed:

WriteMakefile(
 NAME   => 'MyBundle',
 PREREQ_PM  => {
  'Compress::Zlib'    => 1.06,
  'SomeModule'        => 0,
  'SomeOtherModule'   => 1.00,
  'File::Find'        => 0,
  'File::Basename'    => 0,
 },
);
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