Should you need to top up or replace your power steering fluid, a bottle shouldn't cost you too much. You can find a good bottle of power steering fluid for around $10. And, a single bottle should last you for several smaller top-ups, if you need to. Re-filling the power steering fluid is also rather easy. In most cars, you should be able to find a power steering fluid reservoir under the hood. Just look for a cap that says 'POWER STEERING FLUID', or has the symbol of a steering wheel on it. Now, pour a brand new bottle of power steering fluid until you have a sufficient amount. It might also help to have someone steer the wheel left and right while you're adding more fluids, which should help to circulate the fluids further into the power steering system.