Although we've already bought quality food & drink bowls, and a custom made table to hold them, I saw a different way to raise bowls in the pet strore recently.
It was a vertical metal bar with splayed legs, something like you see with an artificial Christmas tree. Attached to the bar were two metal rings, opposite each other but joined together. These rings held stainless steel bowls. The rings could be raised or lowered for the dog's size by simply unscrewing a wing nut. It seemed solid and it's flexibility is a plus, but I don't know of anyone who has used this so can't comment on its merits.