To make gluten-free: You can make this gluten free by using a gluten free loaf of bread.
How to store: You can store these in the fridge or freezer with wax paper between them in an airtight tupperware container. You can reheat them in the toaster oven or on a griddle.
How to freeze: Freeze French toast in a freezer bag or airtight container, separating layers with wax paper. Reheat from frozen in the microwave or in a 350ºF oven for about 15 minutes, depending on the thickness of the bread.