Re brewing coffee grounds
In general, We believe you really should not be in a position to re-use the grounds. That is, for almost any brewing session, your aim is always to extract exactly what you prefer through the beans. If you do this optimally for the technique and taste, you'll find nothing kept when you look at the beans that you would like; re-extracting offers a new outcome. The next brew may be drinkable and even delicious, nonetheless it need a disproportionately small amount of stuff you might want, like caffeine alongside taste substances.
Nevertheless, @Madmanta's response tends to make a great point: it may operate in some instances, such Aeropress or espresso. But this shows you might like to change other variables of one's brewing. Whenever you can re-brew your coffee with an outcome that you like, you might be capable, for instance, utilize less grounds. This saves cash, which seems like it's part of your ultimate goal. Alternatively, you could make a bigger walk with the same level of beans, or raise the removal time. In the case of AeroPress, like, I find that a number of the meals tend to be distinctly under-extracted, and this could be a description for why a second brew works for you; see this Q/A for what after all by removal in this instance.
You can try this experimentally also: make a cup of Aeropress or pour-over as you usually do, then brew another batch in the same way. Including, I get the final couple of falls of pour-over brew becoming watery and off-tasting nevertheless the entire batch tastes better collectively than either of this two components individually. If you want it, go for it. Or use half the actual quantity of reasons next time. :)
As a practical note, you could also start thinking about just to make a more substantial batch of coffee all-in-one go. You'll get a slightly various item but, including, we find that i personally use means less reasons for a 10-cup thermal carafe than for 10 person glasses.