Answering the question of "How can we survive without clothing,food and shelter"?
Food
In general, it is likely that a person could survive between 1 and 2 months without food. As many different factors influence the length of time that the body can last without food, this period will vary among individuals.
Clothing and shelter
My gut feeling with no shelter or clothing you won’t last very long.
You will probably won’t make through a single rainy day at 70 with no clothing, you’ll eventually pass out from hypothermia and likely never wake up unless it got warmer.
Our Basic Needs
A traditional list of immediate "basic needs" is food (including water), shelter and clothing. Many modern lists emphasize the minimum level of consumption of "basic needs" of not just food, water, clothing and shelter, but also sanitation, education, and healthcare. Different agencies use different lists.
