The first step in brewing with a Toddy® Cold Brew System is simple but necessary: placing the Toddy® Silicone Stopper in the brewing container. Toddy® Stoppers can be used indefinitely, but we recommend you keep extras on hand in case they are lost or misplaced. Pro tip: Whenever you're not actively brewing, you can store it in the bottom of the brewing handle (intentionally designed to do just that).