You live off of 100$ for food a month? I'm surprised you don't always eat noodles period.
at ten packages for a dollar at walgreens. add in tax you can get roughly 900 packages a month on ramen alone. at three meals a day at one package per meal for 31 days that only 93 packages. so. technically if thats all you ate you could last almost ten months on $100 worth of ramen alone.