I had to make sure my dog drinks enough water and I have been feeding more canned food and I put water in her kibble and I got low fat, low sodium chicken broth and dilute with water and use it in food and make ice cubes with it also to give the cubes a flavor, you can use beef also if you want variety. My dog gets a cranberry extract pill and EsterC pill to keep her urinary track clear since she has a tendency to form crystals which comes from a ph imbalance in her urine or something like that, I tried to follow the vet explanation.
The fountain and ice is a good suggestion also, IMHO.
I wouldn't give milk unless your dog can tolerate it. If it gives them the runs that will make her dehydrated more.