Please Post Some Ideas for Cheap Homemade Meals on the GO (IE in CAR)

Alright, I am looking for some cheap ideas of things to eat on the go. Sure we got sandwiches but does anyone make a hot meal cheaply that isn't soup in a thermos? On a side note, I knew a guy who used to make baked potatoes in his car engine bay. I think he got the idea from a movie or a show... Anyway, let's hear the CHEAP ideas and bonus to some hot meals.

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Cheers