Op Amp Decoupling with a Virtual Ground
It depends on where the currents are flowing. In general, if current flows from the power supply rails (your +10V/0V) through the load resistor to your virtual ground, I'd use three capacitors, with the one across the 10V supply before the rail splitter and two equal capacitors from the +5 and -5 rails to the virtual ground. 

From the datasheet figure, you might want to consider a dummy load resistor to improve the stability if power consumption isn't a big deal to you.