KFC: House or Caesar Salad
Sorry, people with Celiac, but you're basically beggars at the Colonel's house. The gluten filter on the KFC site yields this sad mess of soft drink options, along with two salads that do not include dressing or croutons. To add insult to injury, they're side salads. We suppose you could pass on the Caesar and load up on corn, coleslaw, and green beans, but that'll just remind you of the other sides you're missing. (Potato wedges, we hardly knew thee.)
A&W: orange float
The bunless burger or hot dog is the move here, but did you really come to an old-timey soda fountain to order a bare beef patty? Nah, you came for a float, of course! The root beer one comes with a "may contain allergens" warning, so get the creamsicle counterpart instead.