I bought some Hi Country sausage casings from Sportsmans Warehouse. They were heavily salted and at room temperature in the store, vacuum sealed. the package says to add salt and refrigerate the unused portion. If I don't use it all this fall, will it keep in the fridge until next year, or should I freeze the rest? will that ruin them? How long are they good for in the fridge. They're natural/hog casings.