I started using AnyList and I generally maintain my weekly grocery list in the webapp and it syncs to the phone and the watch. It is nice once set up, but kinda clunky on the fly. It does add to current list nicely, but that assumes you have a list set up. There is a $10/y sub.
I have not played with the Reminders app for grocery lists, but I believe it can now easily perform that task in spades with the lates update. Will probably try it when my sub for AnyList runs out. At least worth the look before paying for an app/sub. Especially since it is an included app anyway and works across all devices.
Somebody needs cheezits
And it doesnt matter what model phone any of us have. Go see someone and get on the right meds. pot doesnt seem to be helping your paranoia any.