Not quite life hacks, but just the same.
*Dont go to the bread aisle to get bread, go to the bakey and get yourself a french loaf. Cut that hot dog style, fill it with goodies, and cut into sandwiches when you need them. This usually lasts me a week, but it works.
*Dont just make a grocery list, make a weekly menu and go off of that. That way, you can see what you already have and only shop for things you need.
I will think of more as I go.