1. Write to companies for samples.
2. Hang around food kiosks at closing time.
3. Ask local gardeners for their extra vegetables.
4. Attend boring college functions.
5. Join focus groups.
6. Enter restaurant contests.

via issendai

• Mystery Shop
• Forage
• Coupon
• Request Freebies
• Barter
• Accept Other's Surplus
• Seek Out Free Meals
• Start a Perennial Food Garden
• Freegan

via about.com

1. McDonald's offers free coffee for senior citizens age 55 and older.
2. You can get a Free Happy Meal for your child on their birthday.
3. You can get a Free Happy Meal for your child on their birthday.
4. Watch for ongoing promotions.
5. Watch for new promotions.
6. If you have a bad experience at your local McDonald's, talk to the manager.
7. Get free food at grand openings.
8. Write to the corporate office.

9. See the resources section for more ways to get free food and food coupons.

via ehow

1. Forage.
2. Fish.
3. Go to church.
4. Mystery shopping. 
5. Barter.
6. Free grocery samples.
7. Go home.
8. Continental breakfast. 
9. Special promotions.
10. Coupons.
11. Become a freegan.

full list via militaryfinancenetwork