I can see a 5 gallon container of water lasting me the rest of my life.
Dan_ed, I bet you live longer than that!
Like Rushton, I do 2 rinses per side, and find that is very effective in cleaning the record and reducing noise. Without being profligate its nice not concerning myself with using "audiophile grade" water when the Nerl lab water works great.
I haven't found the NERL SKU 0015 aka "Safe & Sure Ultra Pure Reagent Grade Water" for sale on-line. All of them get particulate filtered down to 0.2 microns, so I'm not sure what the higher grade will yield over the lower for record cleaning. Then again I was surprised how much cleaner Lloyd's Prelude worked vs my previous DD or RRL regimen, so one never knows.
Tim