Power steering fluid leak problem?

[Rishabh Kasliwal]

Hi,

I have a 1995 Audi A6, 3L. It suddenly sprung a Power Steering Fluid leak.
The power steering fluid is way below the MIN mark in the reservoir.
The car makes ominous noises when I try to turn either left/right/
I cant see the place of the leak though, it seems to be from somewhere  
below, near the bottom of the engine. 

Where can I get the Audi Hydraulic Fluid G002000 from?, KRAGEN's does not 
stock them.
Is it okay if I use some other fluid while I take it to get it checked?

Thanks 
Rishabh
650 384 5101