This place is mostly visited by RPI's students, but it's open to everyone. From ethnic food to hamburgers, the food is tasty and affordable. You can grab a bite in the McNeil Room on the main floor and Rathskeller in the subfloor. There's also Farmer's market, with a slew of options for quick snacks, and a Ben & Jerry's.
The price is low, and you have good options - Indian included. Plus, there's the Farmer's Market for snacks and small necessities - like toiletry - and coffee. They offer Starbucks there. There's the pub with decent beer offering, and the Rathskeller (1st floor) with hamburgers, pizzas, and whatnot.
The burgers in Rathskeller are a good option for those short on money.