This depends on a country but it is doable.
If this is just for food then yes, here are some ideas.
To avoid lack of vitamins, buy supplements.
Oil, green salad ( discount on huge shopping malls), rice ( 1 kg serves 25 portions), eggs ( are cheep) and canned tuna (proteins, can't eat much of this, so one can of it can last for a few meals). You should be fine, but I don't recommend this.
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Yes, but not not at the level of modern human dignity. Not in Europe. Maybe on other continents.
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If that's your only option
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This depends on a country but it is doable.
If this is just for food then yes, here are some ideas.
To avoid lack of vitamins, buy supplements.
Oil, green salad ( discount on huge shopping malls), rice ( 1 kg serves 25 portions), eggs ( are cheep) and canned tuna (proteins, can't eat much of this, so one can of it can last for a few meals). You should be fine, but I don't recommend this.