According to the Minnesota Department of Health, if your house was built before 1940, then you should let the water run for 3-5 minutes before drinking it or cooking with it. Showering is probably fine, since they recommend doing showering and running the dishwasher first as one way to let the water run before cooking.
This should especially apply if the water has been sitting in the pipes for a long time (e.g. after a holiday).
As far as I know, there are a few different link formats, and how well they work depends on which frontend you’re using:
EDIT: At least using the web app, the first link is relative, and the others are not. So I think the correct format would be
/c/<community>@<instance>
for communities outside your instance.