What type of power steering fluid does the 2012 chevy captiva use?

You can use any off the shelf power steering fluid for the 2012 Chevrolet Capitva; it doesn't require any specific brand or type. Try Prestone's Full-Synthetic PS Fluid, part number AS264Y, from Advance Auto Parts for around $10. It's normal to need to top off this PS a little from time to time, but if you find that you're constantly adding, it's possible you've got a leak, which is only going to get worse. You'll want to document how much power steering fluid you're adding and when, to track this. Additionally, a bad power steering pump could result in fluid that becomes less effective over time, necessitating a drain and refill of the system.