The only item I didn’t own at the time of writing My Favorite Things — the SodaStream — my girlfriend and I received as a gift from her mother for Christmas.
She got us the SodaStream Geneis and we’ve already made about 10 liters worth of drinks with it. So far we’ve mostly used it with the sample syrups that it came with, but we’ve also used it with our own homemade lemonade base.
It’s incredibly fun and easy to use. And so far, it seems that will be much cheaper than buying off-the-shelf carbonated water or soda. If you don’t have one, I strongly suggest looking into it. They’re amazing.