We do this with our little guy. He drinks plenty of water on his own. But he LOVES saltine crackers. So my wife buys the very low sodium crackers. They still have some salt, but nowhere near what the regular ones have.You could, of course, try something salty.
He loves them. And the fact they're so dry, and still contain some salt, really drives him to the water bowl. And the bit of salt he gets helps him retain more water.
This is good, especially in the Summer months out here. When the temperature is very high, and the humidity very low. It is very easy for a dog to dehydrate. Especially if they're active, which he is. A few crackers every day help alleviate that from happening.