solar cooker We like this model best because it's the cheapest we've seen as far as materials, and because we feel it would be the easiest to transport if moving suddenly became necessary, and some very good recipes for it are available here, here, and here.
solar food dryer/ dehydrator I like this model because, again, it would be inexpensive and easy to construct.
Backwoods Homes magazine This site has a lot of useful articles, including 7 Mistakes of Food Storage.
Canning guides can be found here, here, here, and here.
Like I said, these are the best of what we've found so far. Please feel free to spam me with your favorites. :)
ETA: On the subject of rainwater collection I managed to find this, this, this. I'm trying to work out in my head a way to do this with some type of large funnel since we live in an apartment and wouldn't be able to divert from the down spout. And I would like to do it as inexpensively as possible. Any ideas?