One wet food pouch at 8.30am
One wet food pouch at 5.30pm
Crunchy food and water always left out during the day
This is similar to what we do, before getting our cat I was pretty clueless as to their needs.
We feed him a good quality wet food twice a day, morning and evening and leave a bit of dry down during the day for him to graze on if he likes along with fresh water of course.
Best diet for a cat would ideally be raw but that's not always possible or easy to manage for many, alternatively a high meat content (not of animal derivatives - check the packet) wet diet.
Stuff like whiskers, felix, Iams etc are the cat equivelent of fast food, crap content basically, most of them have -5% meat content and what is in it is often 'animal derivatives' otherwise known as any old crap from the animal.
One word on Iams that we were warned about by our local cats protection is that they've been reported for animal testing so advised not to buy that, not that we would as it's low quality anyway.
We feed ours 'Hi-Life' wet pouches, which is available in pets at home and some supermarkets + online, has at least 60% meat in and isn't full of sugar and other crap which can be bad for their teeth.
Incidentally, the whole wet vs dry debate on teeth health has generally been unproven that dry is better for them, what you'll find is ones packed with sugars may be the main problem. Bones and chuncks of meat that forces them to chew and massage the gums is what's good for their teeth, dry food tends to get gobbled straight down anyway or shatters when bit so isn't really cleaning them at all, give them some decent chunks of meat sometimes that they have to really chew on to help keep them clean.
As I've said though the best thing you can do for your cat is to gradually switch them over to a good quality high meat content food and get them of all the -5% meat crap that's out there. For dry we give him Applause dry, which is 80% meat content and low in carbs which cats don't need, it's just bulking crap, it's good meat content they need.
If feeding wet they should get most of their water from that anyway but fresh water should always be down regardless.
Anywho this is what I discovered from reading all about the subject, take it or leave it.