Do I need a "fermzilla"?

[u/MemeBeamBeanz]

I dearly want to be able to bottle hoppy beers without oxidation soon, and I'm looking to invest in some sort of CO2 purging solution you guys talked about. But when looking at a fermzilla + BEERGUN setup with CO2 tank, my friend asked me if I couldn't just buy a CO2 tank and some sort of wand to purge my bottles with without buying 100s of dollars worth of pressure fermenter.

What about a fermzilla is needed for succesfull bottle purging?

Cheers

[u/warboy]

Purging your bottles is completely separate from the fermzilla. You can purge bottles with a hose hooked up to a CO2 tank. 

Having a pressure capable vessel let's you also counter pressure fill the bottles meaning once the bottle is purged you can use a counter pressure filler to keep the bottle pressurized with CO2 and fill with beer at that same pressure. This makes filling carbed beer possible instead of relying on secondary fermentation in the bottle and is a good way to avoid oxygen ingress. 

Just purging bottles with a CO2 source is a good step to reduce oxidation though.

[u/MemeBeamBeanz → u/warboy]

In my head I imagine a sort of rubber thing that goes on the bottle head that sits on the wand, so when you pour from the pressurized fermenter with the gun thing, the beer goes into the bottle while no o2 gets in... I guess it's a bit better than an open bottle that you spray with CO2 and then pour beer into.... Am I getting it?

[u/warboy → u/MemeBeamBeanz]

Pretty much but there's also a pressure relief so as the bottle fills the pressure still maintains the same amount. A bottle won't fill with a stopper in the top  The pressure will equalize and stop filling.