Things done yesterday and today? Found out that there are test strips that will give an indication of stuff in water, including the interesting bits such as copper, iron, nitrites and nitrates, lead, hardness and so on. There's some that will give you 6 values and some that give 14 and some that give you 16 - so we're going to have the 16-value strips for some indication of how different our water samples are.
These are, of course, not very accurate and not comparable with a proper lab analysis of water, but it will be a quick and dirty solution to get indications of differences, and have a rough documentation of them. And then it's always possible to take a bit of the water and hand that in for a proper analysis, should it turn out that it would be really interesting. (Tap waters in Germany usually have an analysis available from the water works, but that might not be the case everywhere, and for the spring waters and creek waters, well, there's no analysis of them anyways.)
So that bit of our experiment is now sorted as well; other supplies and ingredients are on their way, the experiment protocol/guideline and documentation sheets are being worked upon, details are discussed, tea is being consumed, oh, and I've packed some goods to send off so a post run is on the agenda now as well.
I can't believe that it's less than two weeks from now that the Forum starts...