You can get a meal (lunch or dinner) from Seamless for $12 to $15 at the cheapest. So if you do that every day for dinner plus add $5/day for breakfast, well, there are ~30 days/mo., you're looking at around $550/mo., plus lunch. For lunch, you can get food from events for free about 3 days/week for about 6 months out of the year, which means $400/mo. for the 6 months you can't get it free and $108/mo. for the 6 months you can get it free.
In sum, this strategy would cost you about $950/mo. for half the year and $658/mo. for the other half of the year. Of course, if you are willing to buy groceries that don't require "cooking" per se (like cereal for breakfast, pre-made salads for lunch or dinner, etc.), you could make things a bit cheaper (up to 50% less for the more expensive half of the year, probably).