In the country where I am from it's very common in supermarkets that besides showing the total price that they also show the price per liter or kg. This makes it very easy for comparing what's cheaper and what's not. I suggest that you use your phone or something to do this conversions if shops don't show this stuff where you live.
Also I recommend that you stop buying cans and buy 1.5 or 2(.5) liter bottles in general they are much cheaper, also get a house brand (if it tastes good) instead of 7up or sprite should help out a lot. ost of the time bigger quantities are cheaper then smaller but it's only useful as long as it doesn't generate you any waist or doesn't spoil (soda, dry pasta, canned stuff, etc). Also if you think big bottles are annoying to carry get yourself a bidon (drinking bottle) and fill it up by using a big bottle.
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