Yes, you are right - and thanks for clarifying: He does not have kidney issues, but he did have a few times urinary tract infections (the last one was 3 years ago), so since then we have been much more careful with his feeding.
I don't have a steady vet, since I just moved to a new town...
My 10-year-old cat (male, a bit under 4kg, indoor) has been eating for the past 2 years 1 pack of 48g Felix Soup + 35g of Purina's urinary care dry food once a day. I still mix some extra water in there so he gets his liquid intake - he never touches his water bowl. He has been doing well for...