There can be many sources of stress and insecurity that arise at various points in your graduate studies, sometimes unrelated to your academic work. Here are a few helpful resources:
Graduate Student Emergency Grants from the Graduate College for unforeseen expenses, up to $500
For international students: International Student & Scholar Services emergency loans for educational expenses
A current list of local food banks and allied forms of assistance for students facing food insecurity
A list of temporary job postings, especially useful for the summer and available to international students, as well.
In addition, please, if you find yourself in a tight spot, don't hesitate to reach out to the DGS, Chair, office staff, or any faculty member with whom you feel comfortable. Even if we can't offer immediate material assistance, we may be able to help in other ways.
There is also a website where the university posts temp. job searches, and it could be very helpful for both nationals and internationals (during the summer): http://osfa.illinois.edu/types-of-aid/employment/virtual-job-board/.
The Graduate College also has a job board: https://grad.illinois.edu/current/job-boards.