I make all my own compost, as well as manure teas and compost tea. Why would you want to save any? Make only what you need. I use a 5 gallon buchet, which yields me just enough for 1 application, then, 2 weeks later, do it again. Once you have the setup, it only takes a couple of minutes, and fresh tea, seems better, to me. Sure, you can keep it going up to a week, but you really don't need to apply it every week. The microbes in the tea, die soon after the air is removed, and after a week or so, they start to die, anyway. The nutes in the tea, may not be affected, but the microbes are the paramount benefit of the tea. Good Luck.