The Problem: Seltzer water from the store is delicious but expensive. My wife drinks about 5-7 bottles a week, and at a dollar a bottle, this adds up.
The Solution: Creating your own soda water, also known as. sparkling water or seltzer water, is as easy as combining pressurized carbon-dioxide and cold water. We just need a few pieces of equipment, and acompressed CO2 cylinder. Here's the setup I whipped up in about 5 minutes for my New Year's Eve Party featuring Artisinal Litchfield NH Soda Water, based on this article.
Adjustable Pressure Gauge - $51.45
Gas Line with Ball Lock - $10.58
Threaded Cap - $19.99
CO2 (beverage gas) from your local supplier - ~$100 for the cylinder, then $15 per fill-up. One fill-up per year