Yes, you can put soup into Chilly's Bottles. We recommend a really thorough clean straight after use with hot soapy water. For further cleaning please use bicarbonate soda with water.
Heat retention for soup will vary significantly based on the temperature of the soup.
Do not overfill the food pot or leave food inside with the lid on overnight, for more than 12 hours, or leave to spoil. If this occurs, please exercise extreme caution as this can result in a dangerous build-up of pressure inside the food pot.