Posted for "Back to School Photo Tag Lunchbox Special" When cooking with a thermos bottle, it is important to use a thermos that will hold heat the longest, and last the longest under heavy use and abuse. This recipe is based on a 16-17 oz Stanley Food Thermos. The food thermos has a wide mouth lids with an insulated lid that doubles as a bowl. You made need to adjust the amounts to fit your thermos.