Help: Alternative to Amersham/USB kit for DNA/RNA isolation

[Oivnd Enger]

Hi there
I've been using the Amersham/USB kit for simultaneous isolation of DNA and 
RNA from environmental bacteria. However, in my application the bottle with 
the sample buffer goes empty way long before the rest of the kit. Amersham 
on their side refuse to sell this buffer separately and also to give me the 
recipe. Could any of you please help me out by proposing an alternative kit 
or even better an alternative buffer.

thanks in advance
-oivind