Yeah, I know adding water is heretical. I don't add much; maybe an ounce per quart. It's not enough to mess up the salinity; at least I've had good luck with it, and so has my Louisiana friend, George.
If you have a crock, that's the way to do it. A white plastic (food safe) bucket should be just as good; you should be able to get a used frosting bucket from a Walmart bakery or a pickle bucket from a sandwich shop real cheap.