Making dual power supply from single for opamp?
You can use the ICL7660.  It takes a positive voltage (up to 12v) and generates the inverse:



Very easy to use, I've used it in several commercial products.

If the ICL7660 chip is difficult to find, you can also roll your own" charge pump inverter" using a 555 timer, which should be available anywhere, and a few extra components:



There are lots of variations on this circuit, not just for generating negative voltages but also voltage doublers and triplers too.  Just do a Google search for "555 charge pump images".