If your university offers some easy philosophy course take them. And if there are Arts History or Arts Science course take them as well, provided your GPA doesn't suffer. The reason for this is, in philosophy you often read very dry, convoluted, but scholarlary written articles, just like you will on the MCAT. So, its a good practice to start getting use to how philosophers argue. Usually most people struggle with philosophy. Having taken a philosohpy course will help you on philosophy passages.
However, if you decide not to take any of the courses, with sufficient practice you should be able to do well.
If you want to read a lot, subscribe to a magazine like Atlantic (I recommend that because on the previous MCATs two articles were used from it), Economics, Wall Street, Harpers (used 1 article from there), or New Yorker. But you have to seriously ask yourself whether you will read the articles. If you pay for it, you will most likley read it. Try to read about one article or two a day, and then increase from there.
In the VR thread in MCAT Questions, there are some good books, and websites that have good articles. Check them out as well.