Yes you can put fizzy and sparkling drinks into Chilly's Bottles. We recommend a really thorough clean straight after use with hot soapy water. For further cleaning please use bicarbonate soda.
Chilly's Bottles will also keep your drinks fizzy due to the airtight lid. However, the time it will keep drinks cold will vary significantly depending on the drink.
Please be careful when removing the lid if you have been storing fizzy drinks in your Chilly's Bottle. Pressure can build up inside the Chilly's Bottle, and can cause the lid to 'pop' off.