Kattovit Spezial-Drink pH-control

My cat has struvite stones and therefore needs to drink plenty of fluids. She absolutely loves this chicken soup. I’m not so keen on it, though, because a) it’s ridiculously expensive and b) it’s shipped to us all the way from Thailand (is that really necessary?) So here’s the compromise: she only gets the soup when she’s being picky about her wet food, diluted and poured over it. Suddenly, every brand gets devoured. Otherwise, I just mix water into her wet food...