my pharmacist said you must drink it within 15mins of making it. i think it says it on the back of the bag too but i really am too lazy to get up and check. but sounds like a good idea. i put ice cubes.. or really really cold water... drowns out the taste!
i doubt you will lose all the nutrients freezing them, im guessing its gonna be like frozen veg as soon as the veg is picked starts losing its goodness but when its frozen keeps it all