It's sustainable and compatible with a 'normal' life, I found food from:
- student university restaurants, I asked the permission to collect in the bread 'trash', most bread was in perfect state. I heard this food was used for chicken farms
- end of markets, I was even helping merchants in exchange of their damaged but perfectly good legumes and fruits. I was coming back with a lot of food. It's important to eat the most damaged first of course
- some supermarket bins, where I could find some salad plastic bags, eggs. There was other kind of food, meat, biscuits, dishes, but I wasn't interested by those processed foods
If I had $2 per day, I'd buy a huge rice bag periodically, eggs, and damaged legumes every week at the end of markets