I ran it through the touringplans.com menu search tool. According to the site (*note that some inventories may have changed, so you'll have to check again once on-property), you can order Coors Light at several restaurants, including City Works Eatery & Pour House (Disney Springs), Rainforest Cafe (Disney Springs), Raglan Road (Disney Springs), and Sanaa (AKL Kidani) as well as at beverage carts at Blizzard Beach, and at many of the resort lounges and/or pool bars (e.g., Boatwright's, Cape May, Belle Vue Lounge, Leaping Horse Libations, Crew's Cup, Ale & Compass etc.)
You can also buy it as a grab-and-go item at many of the resort mercantiles.
Search for "Coors" if you want to see the whole list.
http://touringplans.com/walt-disney-world/dining/menus