I rely on Subways when I tour. There are more of them than McDonalds in the US and they are in both Canada and the UK, where I've toured in the past few years.
In addition, they have a tasty veggie burger sandwich at most, not all, stores and the places in the US have free ice and filtered water in their drinks machine.
I usually check if there is a Subway in the towns I will stop in or ride through as I plan my trips.