Check your inbox. I just received an email from CVS that tomorrow 6/20, Pepsi 2 liters will be priced at 2/$1 with a $10 purchase! You will need to scan your CVS card at the red magic coupon machine to receive a coupon for this deal.
According to the fine print in the email this offer is available to select ExtraCare cardholders who subscribe to the CVS/pharmacy ExtraCare email program and have received this message directly from CVS/pharmacy. Limit of one coupon per cardholder.
If you are not subscribed to CVS emails head over here and sign up so you can hopefully get in on future offers like this one.