Does your SodaStream bottle also look at you with seasonal guilt? Carbonated filtered water fizz dies in about four to six hours in an open container in the fridge. Closed, it lasts two to three days before becoming flat. The CO₂ escapes through the plastic micro-pores, leaving you with sad, salty remineralized water.
Pro tip: Don’t refrigerate carbonated bottles upright. The pressure pushes CO₂ into the headspace. Store them sideways to keep the liquid in contact with the lid, reducing gas loss. It works—I tested it with a 2-liter bottle of sparkling lemon water, and it still popped on day two.
