Went to Kroger yesterday and noticed that they had a R/O machine set up were you could fill up their jugs or your own. .39 per gallon to fill your own container, or .69 per gallon to fill their jugs. It gives a nice explanation about the process etc. Besides my salt mix, is there anything else that I need to add to the R/O water? At the encouragement of several fellow board members, I have decided to switch completely from tap water to R/O water.