You could also organize your weekly shopping list by store (grocery, high-end market, bulk store, drugstore) but I like to organize by type of product. Whatever works for you, do it. (See also: Tools to Organize Grocery Shopping)
I divide mine into the following categories based on the set up of the two groceries stores I regularly shop in (Stop and Shop and Whole Foods). I bet your grocery store is similar.
Bathroom Supplies & Toiletries
While I am not a fan of buying in bulk, I do suggest you have 1 extra tube of toothpaste and bottle of shampoo on hand for emergencies.
___ Hair Gel/Oil/Mouse/Cream
___ Hand Soap
___ Shower gel
___ Facial moisturizer
___ Body moisturizer
___ Shaving Cream
Buying in bulk is more acceptable here because you can store much of this in a basement of attic storage space. Just make sure they are labeled and that anything sensitive to climate (like laundry detergent) is kept at a normal room temperature.
___ Toilet paper
___ Paper towels
___ Cleaning supplies
___ Laundry detergent
Things like staples, envelopes, glue and pencils.
___ Printer paper
___ Pens and pencils
___ Greeting cards (birthdays, anniversaries, holidays)
More about Meal Planning & Grocery Shopping: