There are always crock pots for sale at the thrift store.
Intermittent fasting is another option.
Sometimes vegan and raw vegan foods will do in a pinch. You just have to find salads and things without soy or wheat.
If you're not cutting carbs, you can keep a bag of potatoes or sweet potatoes in your office and nuke one in the microwave wrapped in a paper towel for 3-6 minutes. Goes good with your canned meats.
Female, 5'3", 50, Starting weight: 163lbs. Current weight: 135 (more or less).
I can squat 187.5lbs, press 75lbs and deadlift 200lbs