Where are the ice machines? If you have a cooler, can you fill it at the food court or ice machines? Do they charge for large amounts of ice?

There is an ice machine on every floor of every hotel building, near the elevators. You're welcome to as much ice as you need from these.

Ice and drink machines are near the elevator in every building. Ice is free, as well as you can get a cup of ice water from the cafeteria for free.

Yup as the previous person said they are right around the corner from the elevator

I concur.