If I'm correct, practically all CS meals permit substitution of vegetables (usually carrots) or fruit (usually grapes or apples) for french fries. Actually I think the fruit or veggies are listed as the standard offerings, and if you want fries you have to ask for them.
You are correct. Usually a counter service kids meal will list "choice of two" and then only show the healthier options. Drinks choices are usually listed as milk, water or juice. It is noted below that "fries and soft drinks are available upon request".