This Instructable is more for students and people who don't own many kitchen utensils.
I used to live in a single room. I had a fridge, a microwave and some basic kitchen utensils.
I did not own a grater and due to the limited space, did not want to get unnecessary tools.
One thing I always had in the fridge was cans of soda (ok beer)
I could have used those cans to make an improvised cheese grater.
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Empty a soda can and wash it.
Cut off the top with a can opener.
Poke a few holes in the can with a screwdriver or another sharp object.
Then put the screwdriver in those holes and tear them downwards to make the blades.
Now you can grate the cheese with a soda can.
Most of the cheese will stay in the can.