Patty, I'm not sure what you mean by a "complete feed"? You mean kibble or other dry foods?
Are there certain symptoms that B owners should look for if they're concerned about slow dehydration?
I have been observing Bowpi's minimal water intake since we got her. She does drink more after sitting out in the sun, on hotter days, or after running, so I think she self-regulates okay. I did make sure to note her kidney values when she had her blood drawn up last month for her dental work, and they were normal. But just as I think it's important for me to cycle through a lot of liquids each day, I want her to do the same. She is not very interested in plain water though, which is why I make up broth. I'm intrigued by the vegetable/milk broth you've posted, Patty, so I may try that too.
What about fruit? I've heard that some B's really enjoy fruits and vegetables, so that could be another way to increase water intake. Our B is not interested, though the Shiba is. He loves melons, which are nice and juicy and not too tart or anything, so when melons are in season, he gets to eat a lot of those with me.