I like making my own fizzy drinks by mixing homemade syrups (lemon-tarragon, lemon-rosemary, lime-mint, etc) with some seltzer water. I didn't like constantly buying bottled seltzer because of all the plastic bottles so I got a soda siphon and some of these ISI soda chargers. Honestly, they don't create a seltzer with as much fizz but that's a small compromise for reducing plastic waste and saving some money in the long run. The empty cartridges can be recycled, too. All in all, a good deal.