Fishing

[Legbreaker]

As my previous posts tried to imply, seafood (and other sources) are almost certainly contaminated with something, however, if you're hungry, you'll eat anything.

I've got some numbers at home for food requirements and space necessary to support life in a sealed environment. Not a lot of help with collection, but could be useful working out space necessary for crops, animals, etc.
I'll post the link in about 10-12 hours.