I use, like Whart, reagent grade water for my record cleaning chores. While I don't have a fancy US cleaner, I do use it to mix up my surfactant solutions and as my two rinse. I got mine from Amazon for a similar price as above.
http//www.amazon.com/gp/product/B0018EDGLM?psc=1&redirect=true&ref_=oh_aui_detailpage_o04_s00
http//www.amazon.com/gp/product/B0018EDGLM?psc=1&redirect=true&ref_=oh_aui_detailpage_o04_s00