I like to eat the same things each week, with as much frequency as my family will allow, so we have a grocery list that is almost the same each week. It depends on what you like to eat. If you're single and no one else minds, why not decide what to have on Monday, Tuesday, Wednesday, etc and then just know that you are having it for dinner, and buy that.
What do you like for breakfast?
Lunch?
Dinner?
Snacks?
I usually have the same thing for breakfast for most days, similar type things for lunch, and then whatever dinner thing my family is interested. For example: I make smoothies for breakfast, have sandwiches or hummus and crackers for lunch, and then for dinner we have grilled chicken and frozen veggies, tacos, spaghetti, ground turkey burgers, rice and beans, chicken casserole, things like that. For snacks and times when I don't feel like making something I buy: cereal, instant oatmeal, apples and peanut butter, carrots, pistachios, jelly beans
Then when you have a list it becomes familiar to you at the store, where to pick up your items, and you can breeze through the list each time a little faster so it is less of a huge chore because you know where the same things are and have a list of exactly what is needed.
just make sure you thaw out your frozen things ahead of time for dinner the next day.
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Your Aspie score: 165 of 200
Your neurotypical (non-autistic) score: 48 of 200
EQ 12 SQ 70 = Extreme Systemizer