Say you're going for better helth this year but aren't prepared yet to really reduce your food intake and exercise regularly. You still can by just modifying your diet. Example, go for less salt.
Reduce the salt you use for cooking. Season the meat already and just add more of flavorful ingredients like spices (pepper, chilli, onion and garlic) and stuff that are rich in umami (like tomatoes, real cheese, etc).
Avoid having to need water retention remedies later. Even chips have healthier alternatives now that offer less junk and sodium but still provide crunch.
One other thing you can do is to decrease the times you eat processed food and the times you eat out.
Just do this one thing and reap the benefits of a healthier kidney!