9 hours ago, paulraphael said:
I'm a big fan of iSi generally, just not for carbonating drinks. Even at 42 cents it's wildly more expensive than the other options. And slower, and less controllable, and more of a nuissance. Ideally I'd like a big tank under the sink that holds 20 lbs of CO2, with a regulator and an attachment to carbonate things in regular 2L bottles.
What you're looking for is:
and 4) a carbonator cap: https://www.amazon.com/16-Gas-Line-Assembly-Ball/dp/B0064OI77Y/ref=sr_1_3?s=home-garden&ie=UTF8&qid=1521298041&sr=1-3&keywords=ball+lock+gas+line&dpID=419E02PgkoL&preST=_SX342_QL70_&dpSrc=srch
If you wanted to get crazy fancy you might get a diffusion stone like this, to help the gas get into the liquid faster by virtue of much larger surface area of zillions of tiny bubbles: https://www.amazon.com/Diffusion-MRbrew-Micron-Kegging-Homebrew/dp/B0728DY9P7/ref=sr_1_1?s=home-garden&ie=UTF8&qid=1521298188&sr=1-1&keywords=diffusion+stone&dpID=41cQ61Gfa%2BL&preST=_SY300_QL70_&dpSrc=srch
That whole lot comes in at right around $200... You can carbonate anything in a bottle that takes a standard soda cap. Stay away from glass bottles, as most modern glass is designed to contain pre-existing carbonation, but not beefy enough to reliably take a carbonation charge without going all glass grenade.
