I drink at least a liter of sparkling water every day. It's so fresh, so good with food, so... fizzy. But I quit buying it a long time ago, in favor of a SodaStream seltzer maker. SodaStreams can get a little expensive, though, and the CO2 canisters aren't very large. If you are the handy type, and are willing to handle some details measured in psi, you can build your very own under-sink carbonator. Here's how, courtesy of The Etsy Blog.
An Etsy blog reader shared a very detailed and thorough step-by-step for making a home carbonation system — complete with an equipment list and step-by-step photos.
It doesn't look terribly challenging, thanks to these great instructions. The benefit of this system, too, as compared to a SodaStream, is that everything sits tucked away under the sink instead of out on the countertop. Also, you can use a much larger CO2 tank; the writer says it lasts him all year, as opposed to the two or three weeks a SodaStream tank lasts in my household.
• Read more: How-Tuesday: Build Your Own Seltzer Maker at The Etsy Blog
Would you ever do this? Install a homemade carbonation system?
Related: Good Question: Fizzy Waters - What's the Difference?
(Images: Randy Stoltzfus)
How To Cook Fluffy, Tasty Quinoa
Recipe: Spring Fruit and Nut Tabouli
Good Food to Share 
The Big Book of Small, Cool Spaces 
Apartment Therapy Presents 
The Eight-Step Home Cure 
TW Salt Mill by Wil...
The Ultimate Used Furniture Cleaning Kit
Ana Creates a Community at Home
We have one of these! Minus that nice little valve they put in mid-hose. It was cheaper and easier for us than the SodaStream. There's a place down the road that fills the CO2 tanks for $15 and one fill lasts about 500 liters. Love it. The boyf's obsessed. He carbonates everything he can get his hands on. (I was lamenting how we were out of sparkling wine the other night and he wanted to carbonate a bottle of regular wine for me...ha!)
If the bf or I were handy I'd absolutely do this. I love love love Italian sodas and have no less than eight flavored syrups just for the sodas.
This has "my sweet husband" written all over it...especially when we could each drink our weight in San P every day.
This is awesome! Totally going to make this.
I am SO going to do this someday.
No-brainer: I already have a kegerator and CO2 for my homebrews.