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Mailchimp email collection separation question

I have connected a signup form to mailchimp and everyone who signs up using the form is properly being exported to mailchimp.
My question is, I have two sign up forms, one for a blog subscription, and the other for a daily message subscription, I am using mailchimp to automatically send new post to the email subscribers using RSS feed. Is there a way I can separate the audience and still be in one audience? Maybe tags? I am trying to keep the client on the free plan so i cant do two audiences and want to have people who subscribed to the blog seperated from people who subscribe to the daily message.
Kind of hard to explain so if I butchered that drop an F in the chat. Any help is appreciated.

Yes, you can read about using groups here: Getting Started with Groups