Jay Honeck wrote:
of convenience (hey, it was there), not taste, as the water at OSH is
really quite excellent -- as long as you avoid the water fountains in
the South 40, which use water apparently from iron-laden wells.

As Paul mentioned, I'm pretty sure that the airport draws water from
several different sources, as there were differences in quality
depending on what fountains you used.

Where we were situated the water was particularly bad. Drinkable, but
not great.