Broth will keep for several days in the fridge. You can keep it unfrozen for longer if you bring it to a boil for about 10 minutes every couple of days. So far as I know you can freeze in Tupperware. I was always too cheap to buy T’ware, but I froze broth & soups in old yogurt containers for years. I am trying to move away from plastic now, and use canning jars instead, because I have a lot of them. The only thing to be aware of with glass is not filling them too far, so that the liquid can expand without breaking the glass.