We are planning a big brew day for national homebrew day at my lhbs. There will be tastings, food, live music and of course, brewing. We will have perhaps a dozen brewers bringing their systems to brew several different styles in the parking lot. The biggest concern is the water. The lhbs owner won't get his well water tested so we don't really know what we're brewing with. The water tastes fine with a slight mineral "bite", my t.d.s. meter shows a total dissolved solids of 104 ppm, and the pH is 5.4. Any suggestions? Thanks for your time.