Build a water purifyer by having a wooden trench with a series of tighter and tighter plugs with cotton buffing if possible (But still able for water to get through). 100ft lengh, 2ft wide. Won't be perfect but it will help.
Uh, what unit of measurement is "50 metal" in? I don't need exact amounts, but it'd be helpful to know what that corresponds to if we wanted to suggest projects to work on in an option.
Also, very nice job thus far. This is an interesting read