Ask your teacher. In a pinch a regular thermos bottle will work. Small glass vials. 20 ml borosilicate glass scintillation vials from VWR work particularly well. Thermocouple thermometer 8.
Liquid nitrogen can be hazardous.
Splashing the liquid into your eyes may cause severe corneal frostbite and blindness. Always wear goggles and gloves when handling liquid nitrogen. The other major danger is asphyxiation. Liquid nitrogen rapidly boils into large amounts of liquid nitrogen gas. In an enclosed space, the nitrogen gas can quickly drive out all of the other gases including oxygen.