I make simple artisan bread (1 cup water, 2 cups flour, 1.5 tsp yeast, 1.5 tsp salt). It usually starts to look like mold spot start growing in about 4 - 5 days. Is there anything that could be added to the ingredients to make it last longer? Or any modifications to the recipe?
If possible, I'd prefer to add ingredients instead of extra steps like putting some in the freezer, or keep in air-tight container, etc.