@Iluviaporos - There are still a lot of places in the world where the average household doesn't have electricity, let alone a fridge or freezer. There are other ways of keeping food cool. Root cellars, for instance, were a common addition to the house once. Ice boxes were relatively recent and aren't really used by anyone anymore.
Cold water is often provided in hot countries by putting warm water into an unglazed jar and letting it sweat, which draws the heat out of it. You can use that same trick to make a DIY fridge when you're camping.
And fresh food is something that we all expect to have access to these days, but it was once a luxury. Food preservation doesn't depend on cold storage after all. Smoke, salt and drying techniques have worked for generations.