Can a water well with a lid be used as fallout shelter temporarily ?
The best one can do is hide in a basement (if a basement is there). Most basements in India are unsuitable as shelters as these have large windows and air vents. Otherwise not much you can do except crawl under a wooden bed and use face masks.
Get wooden beds made (called 'takht' in Hindi). And buy gas masks or welder masks.
Decorative beds and box beds do not work well. You can crawl under a wooden table as well but not a comfortable situation if you have to sleep there.
You can convert one room of your house to a panic room by boarding up windows and installing heavy doors which lock securely. Although this idea is also difficult in India as we have large windows with ventilators. Small windows are easier to board up.
Next idea is to move to countryside in case of war. It is very likely that war will be protracted this time. One year is minimum. So you may need a countryside home to survive.
In my home all beds are box beds. There is no table large enough to hide. All windows are very large. And my house is right in the middle of action.
Unfortunately India is totally unprepared for nuclear war.