The following is a checklist for preventing CKD in cats:

I would recommend checking out these additional articles as well:

Water - It is the most important element and plays a crucial role in flushing out toxins.  Make sure a healthy cat have at least 50ml water per kg(body weight) daily. A 4kg cat will require 200ml of water. Wet food contain around 75% Moisture.

Feed Wet Food - To increase water intake. 

AIM Supplement - Help do the kidney cleanup.

Fish oil and Q10 - Helps protect against many systemic inflammatory diseases. 

Brushing Your Cat's Teeth - The buildup of plaque and tartar on teeth can harbor bacteria, which may enter the bloodstream through inflamed gums. Poor dental hygiene can contribute to the development and progression of CKD in cats.

Household and Human Products - Be aware of the ingredients of the products. Including chemicals for house cleaning and air freshener. Some plants or flower ingredients that are highly toxic to cats are used in cosmetic products, lotions, perfumes, hair products, etc. Additionally, toxic foods such as chocolate, coffee, and flower tea can be harmful if cats come into contact with them. Please remember to wipe your mouth before kissing them.