The only way that my spouse and I remotely come close to buying everything we need at the store is by using AnyList and training ourselves to add items to it the very moment we realize we need it. I've pulled out my phone in the middle of a doctor consultation just to add "Cat Litter" to the list, because I know if I didn't do it then, I'd forget, and wouldn't remember again until it was too late and the cats were already in active revolt.