You've never looked at the source code of a CPAN module before? Get thee hence to /usr/local/lib/perl5/site_perl/5.8.0/ and read, man!

More, usefully, you could do the following:

1. Download the tarball
2. Unpack it into the distros directory under your home directory
3. Browse the source (it's in the lib/ directory)

Yeah, Expect uses IO::Pty and IO::Tty. IO::Pty uses IO::Tty. It looks like they're all PurePerl and that the non-core dependencies stop there.

As for putting them into your script ... literally cut'n'paste the entire .pm below your source code. Something like:

#!/usr/local/bin/perl

use strict;

$|++;

# My code here
# Do not put any use statements!! You've already "used" the modules

package Expect;

# blahblahblah

package IO::Tty

# blahblahblah

1;
[download]

Note: This will bloat the size of your script to about 10k lines. Hope you're paid by the KB! :-)

Another option would be to bundle Expect and IO-Tty in with your code as a distribution to be installed. Just install those modules in the same directory as your script(s). *shrugs*