How can I access the value of an apex:repeat element?

I have a Visualforce page that generates a comma-separated list of organization (account) IDs. I'd like to pass that list on to a report as a parameter.

In the example below, Organization Member is a junction object that connects Campaign and Account.

I'd like to have a link in the page, something like the following:

Important Report on Accounts in this campaign
Note that this VF page is using the standard controller. I'd prefer a solution that didn't require a controller, but if a controller is necessary, I'll use it.
  {!account.Organization__r.id},  

Can I get the full comma-separated value out of $Component in one piece or am I going to need to iterate through the individual values of the outputtext elements and gather them up somehow?