Need RO set up help...

[fencer]

I don't think you need to use the Vampire tap as those are used for pipe(in the basement). You need according to your pictures : on the cold water line a t connection and a valve to shut supply off to the RO unit. So the T connects to your cold water line, then the valve connects to the T and then connects to the input of your RO unit. You are going to use brass fitting to connect all this. RONA can help you with this.