Water: EASY! "Web-Tex Survival Straw". Treats up to 1600 liters, fits in your pocket, and you can find them on Ebay for about 30 bucks... What more could you ask for?!?

The cheaper brands only last for like 50 liters, waste! Check out the Web-tex site for other goodies. You may have a harder time finding a few of them in this country, but ebay always helps.
Food: Pack rice and oatmeal (oatmeal's lighter, and tastes WAY better IMO. You can eat about half of everything around you in the woods if you know what parts of the plant are good and how to prepare them. So long as you've got a pocket knife you can prepare a fire by cutting back some sticks and making a bow with your shoe lace. I've done it several times, it's a REAL pain the first time, you'll have blisters, but the second time is much easier, and after that it's just no big deal, takes longer to find good sticks more than anything.
Sam's club has 50 -
200lb bags of rice CHEAP!!! IMO the smartest thing you could possibly do is buy the backwoods home back issues and
READ before you spend!!! These people are living the "off the grid" life right now, and can tell you from practical, personal experience what it's really like. Not what a bunch of yahoo's imagin would be the right thing for you to do.
If you have any intentions of not just throwing your money away, START HERE!
http://www.backwoodshome.com/Their "anthologies" are WORTH THERE WEIGHT IN PLATINUM!