Pretty sure the water comes from Eagle Creek. I'm also from Zionsville and use RO water and build up using Martin's spreadsheet as a guide. Thanks Martin! I had not entered a NHC in over 10+ years until this with two beers advancing and a bronze in the finals. Highly doubt the results would have been the same with city water. Do yourself a favor and buy the RO water from a grocery machine or install a basic RO kit for as I have done. Good luck and feel to contact me for questions.