A closed system for rehydrating powder and delivering the rehydrated powder to a reactor, may include a liquid reservoir for containing liquid； a syringe configured to contain powder to be rehydrated； a reactor； a controller for controlling operation of the syringe； and a conduit fluidically linking the liquid reservoir to a port of the syringe, fluidically linking the port to the reactor. The controller is configured to operate the syringe so as to draw liquid from the liquid reservoir into the syringe and rehydrate the powder, or to drive the rehydrated powder into the reactor.
