Same here (Drinkmate brand, using SodaSense for swapping the bottles), about 3-4 years ago. Even though by my calculations it's close to the same cost as buying

Same here (Drinkmate brand, using SodaSense for swapping the bottles), about 3-4 years ago. Even though by my calculations it's close to the same cost as buying the canned flavored soda (i.e., LaCroix at Costco), there's a lot less waste. Actually, I did the comparison years ago so I wouldn't be surprised if now it's cheaper than buying the cans. I flavor it myself by squeezing a bit of lemon or lime (sometimes other fruit) it in.