Juggler writes -

So I like carbonated beverages. Soda, Beer (especially beer), Champagne, whatever bubbly.
So I found this Lindsay Press deal about how to make your own soda.

1. There are three options
2. Spend a lot of money and buy a commercial soda fountain or it’s parts. Expect to pay at least $200 even on ebay for a carbonator unit (a pump and a chamber probably without regulators)
3. Ferment. Take sugar water, add yeast and wait. This is definitely the lowest cost solution, but I don’t like to wait.

OK There is a fourth option: Buy the premade stuff (but hey, this is “instructables” right? We like to Do it ourselves.

So Stuff you will need: CO2 canister – If you can’t afford one (or don’t drink enough beer to have a kegerator) then troll the streets. Restaurants often leave these out in back to be exchanged with new ones. Choose a large chain restaurant to steal from. No, don’t steal. CO2 is useful for other projects. Buy a cylinder. They last a long time (essentially forever) You will need to buy a regulator. $40. buy a new one.

instructables : HOW TO – Make your own soda on the cheap – Link.