Lots of bread choices without an oven. Tortillas and chappatis are rolled flat and cooked on a dry grill, as are english muffins. Native american/italian fry bread/fried dough, yeasted or baking powder leavened is, well, fried. Corn pone or hot water corn bread is also a fried dough. Benjammin's dutch oven option is an historic favorite, but an oven is just a way of supplying indirect heat-any sauce pan will do, if you can devise a rack to keep the dough off the bottom and away from the sides of the pan as in a bedourie oven. . An oven can be made from a cardboard box.

In medieval times, peasants spent 80% of their income on bread, and bakers were regarded as alchemists-the church held special masses to bless them and their art of taking a bland beige powder and turning it into the wonder of bread. And now we have WonderBread, not wonderful at all, but much cheaper.