I do follow the same diet every day for my dogs. I make it in large batches and freeze it in ice cube trays so that I can just take out the cubes and defrost them. I calculate out their daily requirements so I know how many cubes each dog needs. When they get frozen, I pop them all out of the cube trays and put them into vaccum sealed bags and I take them out daily as I need them. I then add my supplements fresh at every meal. I never freeze or heat food with any supplements pre added. I do give them additional things like blueberries, bananas, other veggies as snacks but for the most part, their basic diet is the same. It has worked for me, I am much happier with home cooked than with commercial for my dogs, but I have used commercial diets in conjunction with home cooking (although that is coming to a screetching halt now that Barney has had two bouts of pancreatitis due to commerical food). My dogs have always thrived and this is true for Barney
and Daisy
who, despite their puppy mill beginnings and some congenital issues, barely look like they are almost 10. Can't say the same for Teddy
, he is thriving too but he comes from a more distinguished pedigree (excuse us!) and a great breeder and he is so young that it's hard to draw conclusions regarding diet.
The choice to home cook or not is individual and has many factors to consider. There are plenty of dogs out there eating dog food who are living to ripe old ages and having few health problems.
As for home cooking, there are many ways to do it. If you decide to home cook, I will echo what other posters on YT have said - yes, you can find recipes but I'd get a diet formulated for your dog by a vet nutritionist so you know you're covering all of your particular dog's nutritional needs in terms of nutrients and in terms of calories and that your dog's medical history and current medical status are part of the analysis.
Good luck.