I've been there last year, luckily I owned a car so I didn't have to dropout of college and the weather wasn't to bad.
1. Find friends to couch surf.
2. Get a job right away for income.
3. As many said before 7/11 saves lives but be inconspicuous about it.
4. Shower at Community Colleges gym area.
5. Food banks will help.
6. My college had a food bank on campus that was available for anyone.
7. Go to churches to see if they offer shelter or food.
8. Some shelters get full easily.
9. Look for soup kitchens
10. Library's are a great resource to stay inside, warm, use of the internet, and assistance if you are unsure on many things. Just be open and honest about your problems and they will hook you up.
11. Use bathrooms at Speedway, Malls, Walmart, Fast food places like McDonald's, etc.