Perhaps a flat lid, stone, street sign, or piece of metal, and a fire of some kind. You don't need an oven for bread made of flour and water.
Madness string 7121
So I got out my boat... and I got out my shop-vac... and I plugged it into my generator... and you know those blow-up raft things? That's my boat, see. So I used it with the shop-vac and I took it on the river.