Try giving him a good tasty drink immediately after his meal Mine are not drinkers (and in many years I've never had a Basenji that is) so I weakly flavour water with meat juice, veg water and actually anything tasty left over and they each have approximately third of a pint as a 'dessert' after their main meal.
Ah yes, the flavored water trick. Last night I put some cut up chicken breast in a bowl, added some water and stirred for flavor and down it went. I got a copy of the urine analysis and it said PH was 8.5, trace amount of protein and Amorphous Phosphate Crystals 2-3. I just collected another sample today and it's yellow cloudy. Not red or pink.