Ever want to get out of paying $1 per bottle of carbonated water? Well you can, and as it turns out, it’s pretty easy. I just purchased a kit off eBay that had a 20oz paintball CO2 tank, a regulator, and the correct soda cap. It was pretty cheap as well, around $130 shipped. The paintball CO2 tank can be filled at many places for around $5, it lasts for about 40 – 60 2 liter bottles, depending on how carbonated you make them.
Generally, if I drink 1 2 liter per day it’ll last a month and a half. I make them very carbonated though, about what you’d get from the store. One note is I push the PSI higher than you probably should, 50PSI, I found that if I put it lower it wouldn’t get carbonated quickly enough for my liking. However, this will vary depending on how cold the water is that you’re trying to carbonate. 
How To:
1. Fill 2 liter bottle with water, leave some space at the top.
2. Carbonator attachment on bottle has a pin on top, push it down and squeeze the bottle to remove excess air.
3. Attach hose to carbonator by pulling up on the attachment and pushing down.
4. Screw down pin on co2 tank until you feel it pushing down on the tank’s pin.
5. Adjust PSI on regulator until it’s at 30 – 35PSI (Or higher, depending on how cold the water is in the bottle, 50PSI works best but not recommended by most.)
6. Release Co2 via the red lever on the side.
7. Shake bottle for 60 seconds or so.
8. Turn off the co2, unscrew the valve, remove attachment from carbonator.
9. Remove carbonator from bottle and enjoy freshly carbonated water.
Soda requires different steps, I haven’t done it so I don’t know. This process might seem complicated, but it’s really easy after you’ve done it a few times, and it saves a bundle of $ very quickly if you drink a lot of it. Personally, I drink it on and off but when I’m in the mood I drink 1 – 2 bottles in a day.
So there you go.. Quick, easy & cheap carbonated water. Forgive me if I’m using incorrect terms to describe the components
Kit can be found at KegConnection.
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