You can buy straight taurine as a powder off iHerb. I used to use it along with other supplements in a home cooked medical diet from a vet nutritionist (but Melbcat decided the meals weren’t yummy 😔)

Other options are feeding him heart which is rich in taurine. You can buy beef heart and cut it in strips but 2-3 chicken hearts a day could be very affordable and snack sized. Don’t give too much. I’m not sure whether to serve them whole or cut, cooked or raw, there’s different advice and I always either gave a supplement or fed nutritionally complete food.

Another thing I can’t help with is dosage, because the recipes are individually formulated and idk how much the urinary food has. Though the internet says 500mg a day?

If you have any doubts ask your vet about it or just check if the local shelter might accept the food. There might be a kitty there who needs it and the Smitten brand from Woolies says it meets AAFCO guidelines.

I have no idea if it’s really amazing as it claims to be but it’s solid, very cheap, and the American certification is much better than the slack Aussie regulations.