What are the countries where 1 US Dollar is enough for one times food?
I think there are many underdeveloped and least developed countries where $1 is sufficient to have a one-time meal. It also drills down to what kind of a meal and where you are planning to have the meal. If it's a Resturant than I guess its difficult and if its street side food or food from a hawker or peddler on the street than $1 should suffice for most of the countries in this world.
Also, if the food is burgers and fries and other fast food items than in this scenario also $1 should suffice.
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But if we are talking about a proper meal and that too in a decent Resturant than I think for most of the underdeveloped countries $1 should suffice for a decent one-time meal.
According to the un.org - there are currently 47 countries on the list of LDCs.
Source:- https://www.un.org/development/desa/dpad/least-developed-country-category.html
So the point that I'm trying to make here is that countries where the GDP [Gross Domestic Product] is higher it reflects the average wealth of each person residing in the country. So by this rule of GDP per capita if a country has a lower GDP or falls into a lower GDP rate than there are higher chances of $1 having a great value - and having a one-time meal with $1 is a possibility and vice-versa.
In a nutshell, I would say that in 47 LDC - it would be possible to have a one-time meal with $1

Thanks for this detailed answer. It's really an eye opening one for me.
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