The phrase "barley water" refers to a drink made by boiling barley grains in water until they release their nutrients. It is a refreshing and healthy beverage that can be enjoyed hot or cold. Full definition
Then heat a cup or two to boiling and add fennel seeds — one teaspoon per cup of barley water. (motherandchildhealth.com)
After making barley water, you can add the barley to soup if desired. (westonaprice.org)
There are rest piece on the internet for barley water, you can put barley in soup and you can eat it straight as a grain, barley is really, really good for milk production and has that research behind it. (pregnancymagazine.com)