Curlytails - by 'complete feed' I mean the all-in-one dry feed such as Royal Cainin, Eukanuba etc. I understand kibble to mean the biscuit that you give with meat - is that correct? I call that by an old fashioned UK dog breeders name 'terrier meal' which is broken up pieces of biscuit often wholemeal.
Dehydration can be determined in any dog by just gently pinching the skin which only slowly returns to normal if the dog is dehydrated.
Like you I think water intake is essential and I also think by adding your broth to Bowpi's feed is a good way to increase liquid. I'm sure any problems would show up in her kidney tests, so don't worry.
My Basenjis all love fruit and vegetables (so I'm lucky) but not every fruit, so it's a matter of deciding what they do like. As you say it's another way to increae fluid intake.