Conversely though, wouldn't K-cup and other single use cups be more water efficient? You don't need to rinse out and clean a filter, pot, etc. You just pour enough water into the brewing machine to make a cup of coffee.
So you can either be a K-Cup asshole or a water wasting asshole, pick your poison. Honestly, the asshole tent is large enough to accommodate all of us in some way or another :)
We recycle all our rinse water and tea bags/coffee grounds in the garden. We just keep a large bowl on the counter for the waste and empty it out when it gets full. Obviously this isn't practical if you live in an apartment or so, but if you have the option it works great.