I have a few different technique for keeping organised with shopping lists. The ultimate goal I believe is to make sure you don’t miss anything but also to be efficient therefore save yourself money over time.
The first method is to always have a paper notepad stuck to the fridge. You can now buy cheaply magnetized ones so they stay put nicely. Anyone in the family can write on what they’d like or when they use the last of something they write it on the list.
The second method is to have a range of lists on your phone. Most phones have reminder or digital notepad areas. If I suddenly remember something whilst I’m not in the kitchen I usually have my phone so can add it. My favourite app at the moment to do this is ‘Google Keep’.
The third method and one I would highly recommend is to have your food shopping delivered. Most supermarkets do this cheaply or you can use whatever loyalty scheme they have to pay for your deliveries annually using their schemes. The trick is that the supermarket remembers what you buy regularly so you can go through your favourites list and never miss an item. Be careful though. The item you usually buy may not be the cheapest so remember to look up whatever it is unless you particularly love a branded item and does a quick comparison check.
Finally, I’m very lucky that in my area I have a milkman who delivers for free and with cheaper than supermarket prices. You can order your regular items such as milk and bread to always be on your doorstep and if you are short of an item you can get it delivered for free the next morning which is incredibly useful when you suddenly discover late into an evening your cat’s food is low.