can and how do i add a 2nd battery and 5 farad capacitor to my car stereo?

[Tiffany Grantham]

i want to install a second battery to my car audio.can i run it to my main battery.i will also be adding a 5 farad cap..stock 94 buick lesabre alternator and battery..plus second battery and 5 farad cap..running a 2000 watt 4 channel amp..pushing 4 12s........so can i do it and how should i???