Whole milk. 2% or half and half are both good substitutes.
How to keep French toast warmPreheat oven to "warm" and put a baking sheet inside. Put every finished piece of french toast on the warm baking sheet. StoreStore leftovers in an airtight container in the refrigerator for up to 4 days. Reheat in the microwave, on the stovetop or in the oven. How to freeze French toast
Flash-freeze the leftover pieces on a baking sheet, then put the frozen French toast in a freezer-friendly container or ziplock bag and save them for another day!
To reheat simply warm in the microwave for 60-90 seconds per piece (depending on how thick the slices are).