Hello fellow Tarheel!
You mean this stuff?
Shamelessly stolen from Wikipedia:
Dragon's Breath (dessert - Wikipedia)
Safety
Liquid nitrogen is used in several foods and drinks to quickly freeze them or for the vapors it produces. Its consumption poses several dangers to humans. The extreme cold temperature can cause damage to human tissue, and the displacement of oxygen by nitrogen can cause asphyxiation.[3][2]
At a shop in Singapore in 2016, a woman was burned when the dessert stuck to her gums.[4]
In August 2017, a South Korean boy was hospitalized and required surgery when the liquid left at the bottom of the Dragon's Breath cup caused a 5 centimeter hole in his stomach.[2]
In October 2017, two children at the Pensacola Interstate Fair in Florida were injured while handling or consuming Dragon's Breath. A 14-year-old suffered a burn on her thumb from contact with the frozen dessert. Another child suffered second degree burns on the roof of her mouth.[1][5] Following complaints, the fair's general manager announced the vendor would not be allowed to sell Dragon's Breath at the next year's event.[5]
So much for Wikipedia.
Supercool fluids are dangerous as all get out. We used to go to the welding supply house in Asheville and get liquid nitrogen or LOX for . . . well better not go there. You can carry it in a thermos bottle but DO NOT screw the lid down tight!
You ever travel west look me up.