For food, check out the Supplemental Nutrition Assistance Program (formerly known as the Food Stamp Program). It's easier to be eligible than I anticipated: an individual that has a net monthly income of $903 and less than $2000 worth of countable resources can get $200 of food money per month. They do require you to be employed, but you might be able to get away with doing minimal part-time work.

(It's a US government program but I'm guessing that similar programs exist in other countries.)