My cat will give birth tonight!

Put the food in the same room. Mum won't want to travel to far. Certainly put water or cat milk close by. As for the rest, call your local vetinary practice for advice....it's free. Just to be on the safe side. Let us know how the cat gets on, how many kittens etc.

It really hurts me to see this kind of post, you shouldn't really be breeding your cat while your unprepared. Why are you bringing more cats into this world when thousands are dieing because they cannot find homes. I hope you make sure each cat finds a good home. I find it very selfish when people breed there animals for the sheer joy and to make a couple of bucks. Next time go to your local shelter for your kitty fix.
For now....
the food doesn't need to be in the box, it can be outside the box, chances are she probably won't eat up to 24hrs after giving birth, because most mums stay with there kits for up to 48hrs. Keep the box soft with towels and make sure you change them and keep the box clean! Don't let any other animals around the kits or the mum, they might make the kits sick. Take the mum cat to the vet for a post natel check up to make sure she's ok and schedule an appointment to take the kits in for there shots and to spay the mum. Be responcible for thease kits and the mum, make sure they get the medical attention they deserve!
AND PLEASE SPAY AND NEUTER ALL YOUR PETS!

I didn't read everything above because the list of things you need to do is short. Have her in a quiet, undisturbed area and leave her alone. All she needs is plenty of dry Kitten Chow and water. She will need to have free choice (bowl always full) of kitten chow until babies are weaned.

I really hate to see people chastise someone for having a pregnant cat, when they don't even know the full situation behind it. I myself have a pregnant cat, I brought her in as a stray when she was nail thin and she was already pregnant. Maybe you should find out before you go off cat patrolling.

Just like the others said. Put her in a quiet room with her food and water right beside her. Also put a blanket down on the floor or in some sort of box. When the time comes she will know what to do. Usually they do walk around after delivery. And are able to go outside. My cat had her kittens outside. But just remember don't touch the kittens. They are protective and if she smells your sent on them she will move the kittens. And may continue to do so till she feels they are safe. Good luck!