Surviving in my part of the world takes less than $100 per week. In fact, $100 per week is probably more than what most of our programmers earn, and last I checked a lot of them are still quite healthy, even partying and going out on dates once in a while. :D
TO survive in most of the cities in india with the basic needs,except bombay and delhi: u need just
2 dollars per day for food,
10 - 15Dollars per year to buy 10 shirts and 10 pants
5dollar per year to buy cosmetics
20-50dollars per month for shelter
for a lower class and lower middle class family.