Well, since it sounds like planning is your issue, don't plan. Like others have said, have stuff you eat reliably. I don't buy much produce, but I always have some frozen veggies on hand. I tend to keep stuff like pasta, rice, etc. around so I don't need to shop for them specifically. Having staples generally means less grocery shopping, like I always have a few grains, canned beans, spices, eggs, garlic, flour, etc lying around. I also always have one sweet and one savory snack on hand in case a craving hits.