Forget about eating for a while. Flee!

But you will need some water. And if everything breaks down, finding clean water to drink may be more difficult than you might think.

If you can stay in place for a few days, you can build a solar still . But you'll need water if you're on the move and that's not easy.

That's why you're going to break into an abandon pet store. In there you'll find pretty much everything you'll need to purify your drinking water. It won't be perfect, but it will do the job with most water sources that are simply dirty and unpalatable, not badly contaminated.

The key ingredient is charcoal. The stuff you might use in an aquarium to purify the water for the fish. Get yourself some and with an empty plastic bottle, some sand and pebbles and some cloth you can fashion a serviceable filter. Here are some handy instructions .

It is also a very good idea to boil your filtered water before driiking it, but to do that you'll need to start a fire. Use your handy pocketful of dryer lint to get one started.