I'll be travelling to EPFL in Lasuanne in July for my summer internship. I'll be staying there for 6 months.

I would like to know where I can find cheap food. I have a very limited budget. So It would be great if can know a rough amount it will take for the 3 meals of the day.

One more thing. How much will it cost if I do the cooking ?? ( rough values) .

I cannot help much with prices as I don't know what sort of food you like and how much of what you normally eat. However, two useful threads on here tips on eating cheap? and Frugal Food in Switzerland - Link and Discussion will give you a few ideas of what others do when living (and, hopefully, eating!) on a limited budget.