These days it's tough to do so. But not impossible. You just have to watch your spending.
Try to keep your electric bill, and gas bill as low as possible, buy the cheapest groceries as possible and don't buy unessential things.
My aunt lives on $400.00 a month. Hopefully you're able to find another job that pays more than disability.
Maybe try starting up a website and once built up apply for adsense and put it on your blog although you won't make much overnight. You can make a nice income.