First of all, don't forget to take the infuser out of your shaker! And don't put your shaker in the microwave! Don't use your shaker to mix directly with boiling water. :)
After that, it depends on the carton.
The sweet ones: pour 350mL of cold water, add the powder from the carton, shake well! You can try these flavours hot: to do so, pour into a bowl and put it in the microwave.
The milkshakes: pour 350mL of cold water and then ice cubes, add the powder from the carton. Shake well!
The hot soups:pour 350mL of cold water, add the powder from the carton, shake, pour into a bowl and put it in the microwave for 1 to 2 minutes. Add water if the soup is too thick.
The hot dishes: fill the shaker with water up to the lowest gauge (150mL). For the Risotto, pour up to slightly lower than that gauge. Pour water into a bowl, add the contents of the carton and stir. Heat for 1,30 minutes in the microwave without covering. Leave for 5 minutes, covered with a plate, then heat for 30 seconds in the microwave.