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You shouldn't boil the water when reheating in a foodsaver bag. You can dry out food just as easily in a FS bag as on the grill. You want the water to be at a simmer. Otherwise you'll be drying out the outer part of the meat before the inside is warm. You basically want to "hot tub" the meat up to 120 degrees just like you would a steak. You can put a raw chicken breast in a FS bag and not only cook it but also completely dry it out in boiling water. The FS bag only retains moisture in the bag not the meat.