I haven't found that many good ideas although I've seen some valiant efforts.
I had to spend some time on the road at hotels with no decent food. If you are happy with Olive Garden and Bennigan's, I guess you are fine. I was tired of eating out, and desperately wanted to cook for myself.
I bought half a dozen eggs at convenience stores whenever I could. The easiest meal to make is soft-boiled eggs. (I've attempted chawanmushi in the microwave - tricky to do.) Place the eggs in the coffee pot. Drip hot water over them. Let them cook for a few more minutes. With a bit of salt, it is a satisfying "home-cooked" meal. Condiments which travel well can be used to add some interest.
Your ideas? The only requirement would be that it's easy to clean up in the sink. Oh, you do have a little fridge. The ingredients would have to be something available at a gas station convenience store (some better than others), plus something you can bring with you - umeboshi, for example, and not too heavy, obviously. It has to taste good!