We pre-cook several dishes and freeze them. The frozen dinners work like ice in the coolers without the rising water problem. We just make sure we have one thawed out for easy reheating in the evening.
I do this exact thing. Foodsaver bags can be simmered, and I usually have meatballs in marinara, or green chile pork stew with potatoes frozen in single serving sizes. This way, different guys could be reheating different meals in the same boiling water.
