A replacement car can be had for hardly any money at all (believe me I know - I have bought and driven for a year a car that cost less than a handful of DVDs).
If you have a job already, getting your hands on a few tens of $$$ is as easy as writing a cheque or begging each of your friends for $10 for a few weeks. A crappy car might be beneath your dignity, but believe me it's better than unemployment.
If it is the car being out of fuel - work out your gas mileage, and learn to keep track of your use that way. The knackered car I mention above had no fuel gauge, so I filled the tank to the brim, zeroed the trip counter, drove a hundred or so miles (in a couple of weeks of work trips), topped the tank off - the second filling is the gas you used to do the mileage now showing on the trip counter.
Divide one number by the other and you get your miles per gallon. Work out the max miles you can do on a full tank, and keep re-filling the tank and re-setting the trip counter. It may seem like a saving to have a nearly empty tank, but you use EXACTLY THE SAME FUEL regardless - in fact, keeping the tank topped is better for your engine, because all the water and sediment that gets into your tank stays at the bottom, and you use the nice clean fuel from above it.
Get insurance. But shop around - I was able to save 50% by shopping around when I was a young driver. If you are legally able to, insure for liability or 3rd party only - it's cheaper, and if your car is cheap enough you just walk away from the wreck and get another one for less than the cost of the repairs.
Good luck.
And in relation to your other thread - don't save money by not buying condoms - kids are expensive.
