I have a 2006 Chev Impala and was told my power steering fluid was low. Can I buy my own fluid and add more myself or does it have to be flushed first and add all new fluid?

Maria, Link below explains where to add fluid. not your exact car but should be close. Look for a cap with picture of steering wheel or clearly marked steering fluid.
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Follow These Steps to Add Power Steering Fluid to Chevrolet Impala 2006...

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2009 Chevy HHR power steering problem

POWER STEERING HHR 06 PROB
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possible
stuck thermostat

You'd move slow in that kind of temperature too! Did you check the fluid level? Could be belt is not tight enough and sliping on the pully.

depends on if you got the extended package and what your dealer offered at the time of purchase, But I would certainly check with the dealer, about that leak, but I doubt the power steering hose problem added to that

These is a sign that the power steering pump is not producing enough power and it requires the rpms to be high to produce enough power. the first thing u should do is to check the level of the power steering fluid and level it out if its low. if the problem persist then the power steering pump or its components like the belts may be faulty and you may need a technician to check it out. thank you!

check power steering fluid level, most common reason for noise.

It depends on who your going to have do the actual labor, and if your going to buy a new pump or a used pump from a salvage yard. It also depends on the actual part you'll need. (you can find reasonable parts online here using there catalog)

http://www.rockauto.com/catalog/raframecatalog.php

GM has announced a recall for the Impala and Malibu for the power steering, please contact your local dealer and they should take care of the problem for you.

As you are bleeding the brakes, start w/the furthest line (right rear), have someone add fluid at the same time. Do right rear, left rear, right front, left front until the fluid runs clear. Power steering, disconnect the low pressure hose to drain the canister. Refill with fluid. Repeat procedure, until fluid is clean.

Locate the cap to the power steering fluid reservoir
Remove cap and fill reservoir with GM Power Steering Fluid (P/N 89021184) or any fluid a knowledgeable parts department says is compatible. It may not look like much but there are a few dozen steering fluids available out there and lots of systems aren't compatible with many of them (wrong fluid will disintegrate seals, pumps, etc...)