I also love fizzy water but hate bottles and all the plastic…
I started doing carbonation with a welding regulator, a commercial co2 bottle from a catering supply and some jubilee clips and bits of hose from an aquarium supply.
Similar kind of set up to a home made tubeless inflator from a drinks bottle… Fun… but I like a project so I upgraded and got a corny keg which sits under the sink and is plumbed permanently… I used this kit:
Kegland Carbonator Keg Lid – continuous fizzy water solution
it was pretty easy to set up… cost wise Im sure its much cheaper in bottles… but yeah, it was a project…. and soda streams, yuck basically.
also good for carbonating juice and cider Ive pressed 🙂
We are blessed with amazing water out of the tap here. Not so good in places with grim water!