One way to successfully heat food for your baby is to place the food in a heat safe dish and sit the dish over a small pan of simmering water. (homemade-baby-food-recipes.com)
At least then it would just be a matter of heating the food up when I get home. (familyfreshmeals.com)
Don't heat food in plastic and avoid drinking hot beverages in them both for your health (and the environment, too). (mindbodygreen.com)