You’re paying $7 for a 12-pack of LaCroix. Stop. For the price of one grocery run, you can make fizzy drinks at home for the next six months. No machine? No problem. Baking soda + citric acid + water = sparkling water in 30 seconds. Want actual flavor? Four ingredients get you a better ginger ale than anything in a can. Here’s exactly how to do it—including the 2-minute recipe that costs pennies. Your wallet (and your recycling bin) will thank you.