Cheapest soda hack

My beverage of choice is sparkling water. To eliminate single-use bottles in our household, we have a Sodastream machine to make our own fizzy water. But Sodastream has stopped making the large 32 oz CO2 canister and has upped the refill price on the smaller ones, making it expensive. The solution is a hack: We now refill our own large 24 ounce canister for $5 at a sporting goods store using a paintball canister. (The squeamish can use a SodaMod food-grade canister.) All you need is a $19 brass adapter (mine is Protek) to fit the canister into the proprietary threads a Sodastream needs. — KK

KitchenClaudia Dawson