We order from Doordash a lot, when we've been driving all day & are too tired to go out to eat. It's really easy. You definitely should to give it a try. Lunch is where I struggle, when we're driving. We usually want to get the quickest option available, so we can get to our destination ASAP. I'd love some tips for more healthy/ low calorie fast food or fast casual options that I can find in most areas.
I don't know if you're interested in going through the effort, but we take a cooler on the road. I try to always have stuff to make a turkey sandwich that we can stop at a rest area & put together, if necessary. (turkey, cheese, lettuce, bread & condiments) We also travel with fruit & DH likes to have chips available. Like you, we usually carry sandwich cracker multiple packs for desperate times. Babybel cheese is also good for a quick snack to tide you over. I like to combine one of those with half a green apple or plum for a more sustantial snack. I also carry my breakfast with me for convenience.