Milk lasts a week, meat lasts 2 weeks (and only gets better closer to the end!). The very few things that go bad in less than 7 days (e.g. fresh fish) I just plan so I eat that the first few days after shopping and eat meat later and so on. Bread I typically pick up more times during the week or keep frozen. You can do clever things like buy fruit like bananas with different levels of ripeness so they don’t all go brown at the same time.

A week is a really short time compared to how long most food lasts.