Amateurs!

1. Go to church for the wafer and wine.
2. Try free samples from the pick'n'mix section of the supermarket.
3. Try some free samples from the fresh produce section of the supermarket.
4. Get a dark suit. That will give you access to many events with free food such as:
Art openings
Civic events
Funerals
5. Dress like an office geek and wander into a busy office. Head for the lunch room!
6. Visit people in hospital. You don't need to know them and they usually have something to eat.
7. Head for the Botanic Gardens. There will usually be a section of edible plants or organic vegetable growing.
8. Get on a bus, tell everyone around you that you are diabetic and if you pass out a candy bar will save your life. Pretend to pass out.
9. Join the Army. (free meals)
10. Go to jail. (free meals)

... and so on. These are just a few of the many ways to get free food, I'm sure there are many more. It's just a matter of seizing the oppurtunity when it arises.