My kids got me a cold brew coffee maker for Christmas. Basically a 2 quart mason jar with a mesh filter in the middle. I ground some beans and brewed my first batch and it was delicious. However, I only had flavored beans at the time and while it was tasty, I wasn’t going to chug half of a gallon of flavored coffee in one sitting. How long can we keep cold brew in the fridge and still have it retain its peak “freshness” ?