Ah my fur babies... can't imagine life without them. :)
My dogs drink the same water I drink, bottled, very pure. They do well on it, no marks/stains under their eyes. :)
I add salt to their meals, sometimes I remember to add it to water. They don't seem to need all that much - some, but not much.
I feed them combo raw-cooked, because they are real connouseurs and really appreciate a variety of tastes and smells. Companion dogs have been eating people-food for centuries, and the only harm is to their teeth if you don't take care. Mine are rescues and had already lost many teeth poor things! :(
Hope that answers your question! :)