Foil is not going to radiate enough heat.
We use a clay baker, and we've tried a cast iron casserole all with good results
Any casserole with a lid will work as will a clay flour pot.
This is a very forgiving recipe.
As a last resort cooking it in a standard loaf or bread pan works.
The main rule is all the parts must be preheated to simulate a bread oven.
Play. No matter how you do it, its the hours of yeast action that gives this bread its flavour and crumb.