Going to go against the grain here and say don't overthink it too much, unless you discover that you have one of the rare can't-regulate-intake cats. We have two, who are nearly 7 and 8 and who we have had since the youngest was four months old. (The older cat is his mum, they were stray/feral when Cats Protection found them.)
We've always gone with putting down a nice full bowl of complete dry food (Royal Canin Aroma Exigent) and keeping it topped up. They eat whenever they're hungry.
We then also give a variety of wet food, in fairly small amounts, a few times a day. Whenever they look/sound particularly hungry. 𤣠At the moment I'm alternating between Thrive (a complete food) and Encore (a supplementary food) which are both very high meat content foods with no grains. And we also give the odd Gourmet Mon Petit pouch, because they're only 50g servings and having put one of those down our older cat will have all the best wet bits and her son will then finish it off! For some weird reason he actually prefers Mon Petit pouches that she's already had a good go at than a fresh plate for himself.
And boycat gets a few cat treats each day, he loves Whiskas Milky treats for some reason which are actually meant for kittens! Girlcat won't touch them, but gets a Lick-e-Lix 'cat yoghurt' once every 24-48 hours.
Neither seem to have any trouble with overfeeding, probably because they consider the dry food to be more of an emergency measure than something to wolf down. š¤£
We also have a cat water fountain that they can access 24 hours a day, which I would strongly recommend over a bowl of water. Both cats drink happily from there, even girlcat who isn't so bothered about water (probably because she eats more wet food).
Two top tips:
- Make sure that all/most of their food is 'complete' rather than 'supplementary'. It means it's got the critical vitamins etc that they need.
- Don't feed them in the immediate vicinity of either the litter tray (yuck) or their water fountain/bowl. Apparently cats aren't keen on water that's near their food because, in the wild, their 'kill' could contaminate nearby water. They'll tend to drink more if their water source is a bit further away.
But most of all, enjoy your newfound cat servitude! Don't forget to take it slowly, keep the cat in a fairly small area of the house to start with, keep interactions calm and minimal at first. Our cats were absolutely terrified of humans when they moved in, especially girlcat. They hid under the sofa for quite a while. I'd just go and sit in there with them, chatting with DH or DD or on the phone, just letting them get used to my presence and voice while they also got used to the smells and sounds of our home. Even with such nervous cats, it didn't take long for them to settle in although they're still wary of strangers. Girlcat, who literally hissed at all humans when she was in rescue and also hissed at DH and DD when we met them, has become my little soulmate and lap cat. And boycat is the light of DD's life!