?: You can be very frugal or you could spend a lot. I've lasted on $20 a week, but it's not very fun. $50 per week is decent. That's about $7 a day.
At minimum, 50 dollars per week.
But, that's everyone on the planet, not just single college students.
If dumpster diving, cooking at house, Brown Bag and drinking water from tap instead of being scammed, less than 50$
if frugal 50…
just use the SNAP card.