Make a List
Everyone likes to eat some typical foods. These will vary with each person. See which type of canned food you prefer and make a list of those. This will help you in making the list to shop. Make sure that you do keep in mind that in how much time will you be generally consuming a given quantity.
Do the math and make the shopping list accordingly. However, finalise it only after the next step which is very crucial.
Check out the Specials
There are always specials available in stores. Make sure that you keep an eye out for those. You can also see the prices of canned food in stores like Costco and Restaurant Depot and see what kind of prices they are offering.
Make up your mind purely on the basis of how much you will save and if travelling a few extra miles will lead you to save more money. If so, the extra effort is totally worth it.
Check the Dates
Never buy canned food without checking the date on it. You do not want to buy six months worth of canned food that expires in a couple of months. Make sure that you check the labels and if a certain canned food will be expiring soon, either remove it from the list or get it from another store. This will save you a lot of hassle.
Be on a shopping spree. It is best that you have someone else with you who can help you with moving the cart and stocking in cans. Avoid loose cans and buy those in bundle since they will be a lot easier to move and place in the cart.