A comic of two foxes, one of whom is blue, the other is green. In this one, Blue and Green are getting groceries. Blue is looking at Green, as Green scratches his chin with his tail, deep in thought. A little further away, a purple fox looks at them, seeming amused. Blue: Was it spring rolls? I think you mentioned spring rolls. Green: ...Maybe? Purple: Heh. Blue and Green turn to look at the purple fox as he addresses them. Purple: Same thing every time, eh? Wife sends you to buy one thing, and you completely forget it! Purple raises his tail in embarrassed surprise as Green responds to him. Green: Actually, we're gay. Purple: Oh! Purple relaxes as Green continues with a joke. Green: And that's why we're both at the store, forgetting what we came here for! Purple: Oh, I see!
Make an excel with all your usual items. Either use an online version and color marek needed items while home, or print many hard copies and use a marker to make your current list. Add items by hand if you need something not on the list. Most of the items are constants, so it will be easier to check it at home and see what is needed. At the shop you can circle/cross items so you'll know if more shopping is needed. Else I'll forget it the moment I leave home.
I used to use an app called Out of Milk which was great. You could scan barcodes to add items to your pantry, track it, sync among different users, the whole kit and caboodle. My wife unilaterally decided to drop it and I refuse to go through the pantry to assemble a shopping list without computerized support, so now she takes care of it. and she always forgets to buy stuff or buys stuff we don’t need. I suggested many times to go back to what we had but she’s just not keen on it. Marriage is compromise, I suppose.