This is the best thing to happen to our kitchen...well....since we got a new kitchen! We have a bit of an obsession with seltzer here at Everyday Food and got downright giddy when we found this machine.
This fantastic little guy has a carbon dioxide tank that carbonates your water as fizzy as you like it. All you have to do is screw the bottle onto the machine and give the button a few presses (or a lot of presses if you really like bubbles) and your done! Put the bottles in the fridge and you will always have seltzer on hand.
The company also makes their own syrups to make root beer, ginger ale, etc but we typically like it plain, mixed with a little fruit juice or a squeeze of citrus. The machine is manual and does not require batteries or electricity so you can put or take it anywhere (camping, anyone?).
There are several machines to choose from, the least expensive is around $89 and comes with the carbon dioxide tank and two bottles to make seltzer in. I did some calculating and discovered that after you buy the machine, each liter of seltzer you make costs $.25 on average! That is a huge difference from what you pay at the grocery store aaaaand....no bottles to throw away or keep in the pantry...less waste! When your tank is empty, just mail it back to the company or take it to a Williams-Sonoma. They will replace it with a full tank and only charge you for the gas.
I highly recommend this if you drink a lot of the bubbly or use it in your mixed drinks. Do you ever make your own seltzer at home?