Kattovit Kidney/Renal Drink

This drink used to be a hit with all my cats, it was foolproof. One of my cats would even binge on it and then throw up, so I had to give her just a tiny bit at a time. Now they don’t like it as much as before. Has the recipe changed? It’s a big problem for me because I have another cat with kidney issues, always dehydrated, who really needs to recover and used to love this gravy, but now turns her nose up at it. Before, the cats would dive right in, now they just leave it there. I’ll try a different flavour.