Pick up a Reverse Osmosis AND DI (deionized) water system of of ebay or serch the net for the lowest cost supplier. Replace the RO membrane (TFC type) and the carbon filters every 2 years. Buy a TDS (Total dissolved Solids)meter too and change the mixed bed deionizer filter/bed when the TDS increases significantly. Buy the TDS meter first and check your water before buying the filter. A TDS below 10 is very good water in untreated form. Below 5 is common with good water and RO. 1 or 2 is nearly "theoretically pure" water and certainly good enough for Case coloring or Blacking/High Contrast Black and white Damascus.