You can minimize the effort. I only go down isles that have what I need, so I can skip a lot of stuff without thinking about it. I avoid looking at the racks at checkout or areas that don't have what I need which again means I don't need to exercise self control.

Don't forget supermarkets stacks the stuff you don't need but may buy on impulse at the end of isles, meaning you still have to pass them.

This is where the ancient Stoics come in handy. I still struggle mightily with these kinds of things every single day, but we are animals, after all. It is certainly a lot easier for me than it was before I started studying stoicism, though.

Some gum makes the right decisions a little easier.

A list removes the need to decide at all.