Walgreens – Buy 1 Get 1 FREE Coca-Cola 20oz *Today ONLY* The links in the post below may be affiliate links. Read the Full DisclosureJuly 13, 2018 by Kim Julian Today ONLY download this eCoupon for Buy 1 Get 1 FREE Coca-Cola 20oz from Walgreens. Just load the coupon to your account than head to your local Walgreens to use it.