I just learned several of the campus dorms still have copper pipes! Oh no! No wonder my poor ghost shrimps have not been living for very long (props to OrionGirl for alerting me to this). I have started using a mixture of tap water and home-filtered water in my aquarium. My Brita is supposed to remove copper, lead, chlorine, mercury, and some other chemicals I've never even heard of.
If the new conditions agree with the inhabitants, I will probably incrementally increase the percent of filtered water. Of course, I will continue to add a conditioner just in case.
I know that the home-filter is not RO, but it is not exactly tap water, either. Can we add a new option to the poll? Maybe also a bottled water option, too? I did that for my betta bowl a few times.