Depending on the food, this can keep things nice and toasty for anywhere from 30 minutes to 2 hours. If you don’t have thick tin foil, wrap multiple layers of regular tin foil instead. Not only does this method trap steam, but it’ll also reflect heat back as well.

Look on the thermos’ packaging to determine how long you can safely store food inside. Thermoses are typically only sized for a single serving.

Thermal bags can be purchased at big box stores or at your local kitchen specialty store. Reusable and disposable bags are available.

Only have the cooler plugged in as your car is running so you don’t drain your car’s battery. Check the voltage requirement on the bag to see your cigarette lighter can output that much energy. If not, you may cause the cooler to short out.

Slow cookers work best with wetter foods, like soups, stews, sauces, or mashed potatoes. Your food may continue cooking slightly or it may change in texture the longer you leave it in the pot. Once you turn the power off, you can safely keep the food warm in the pot for up to 2 hours.

Check the temperature of your food with a thermometer after 20 minutes to make sure it is above 140 °F (60 °C). If not, turn up the temperature slightly. [6] X Research source

You can use this method as long as you keep the stove at low heat and replace any evaporated water with warm water. Stir your food occasionally to prevent it from burning on the bottom.

Always use caution when you work with an open flame. Chafing fuel can be purchased in a gel or wick form. Both will work the same way.

Use an oven mitt as you wrap the foil so you don’t burn yourself.

Use a string to tie the socks for added security. Dried beans will also work similarly.

Seal the lid of the cooler tight after you add the water bottle so no heat can escape.

Use a toaster oven that’s large enough to fit your plates if you want to preserve energy.

Plate warmers can be purchased online or in kitchen specialty stores. In a pinch, you can use a large heating pad meant for backs. These can be purchased at your local pharmacy.