Homebrew PCBs

I am right back to square on not being able to afford proxion and am looking at carbide drill and press seen at jameco.com but with no spec sheet. Jameco.com seems to be a good site, company ect. My peroxide bought at dollar store is the cause of long etch times. Has any one tried the edinbourgh etch method? Will food grade citric acid like ones sold on amazon.com work ok?