hmm my method is. Keep pen and paper by the fridge. When run out of something, immediately write it down on the list. Take the list with me shopping. Cross the item off when I've found it.
Go shopping when I'm alert (mornings) and allow time to find things so not rushing. Also when it's not so busy. Embrace the challenge, take a bag/small trolley.
If crowds and noise a problem, some people just put mufflers on. I will also tend to go for the smaller stores that I can handle, not the huge warehouses that consume people (Ikea, Costco, Warehouse, Bunnings). I might choose a smaller market, not a supermarket to get a few groceries. Then I maybe spend the time and money I saved on small treat for myself, like sit in the carwash on way home, library for free books, redeem a fuel voucher etc.
I didn't learn this overnight, but through hundreds of hours spent shopping. I don't like shopping with other people who drag their feet or when I got no money or pressure me into buying things I don't need. Shopping when single is great. I say Lord help me shop and find the bargains. Remind me of what I forget. And often He surprises me.
Anyway. I say shopping when single is great because you don't need to always think of someone else when you out shopping, and wondering, will he or she like this and then get the wrong thing and waste your money.